Reformat the WebRTC code base

Running clang-format with chromium's style guide.

The goal is n-fold:
 * providing consistency and readability (that's what code guidelines are for)
 * preventing noise with presubmit checks and git cl format
 * building on the previous point: making it easier to automatically fix format issues
 * you name it

Please consider using git-hyper-blame to ignore this commit.

Bug: webrtc:9340
Change-Id: I694567c4cdf8cee2860958cfe82bfaf25848bb87
Reviewed-on: https://webrtc-review.googlesource.com/81185
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23660}
diff --git a/rtc_base/callback.h b/rtc_base/callback.h
index 0e035ad..65b7c9c 100644
--- a/rtc_base/callback.h
+++ b/rtc_base/callback.h
@@ -73,8 +73,9 @@
  public:
   // Default copy operations are appropriate for this class.
   Callback0() {}
-  template <class T> Callback0(const T& functor)
-      : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {}
+  template <class T>
+  Callback0(const T& functor)
+      : helper_(new RefCountedObject<HelperImpl<T> >(functor)) {}
   R operator()() {
     if (empty())
       return R();
@@ -87,24 +88,23 @@
     virtual ~Helper() {}
     virtual R Run() = 0;
   };
-  template <class T> struct HelperImpl : Helper {
+  template <class T>
+  struct HelperImpl : Helper {
     explicit HelperImpl(const T& functor) : functor_(functor) {}
-    virtual R Run() {
-      return functor_();
-    }
+    virtual R Run() { return functor_(); }
     T functor_;
   };
   scoped_refptr<Helper> helper_;
 };
 
-template <class R,
-          class P1>
+template <class R, class P1>
 class Callback1 {
  public:
   // Default copy operations are appropriate for this class.
   Callback1() {}
-  template <class T> Callback1(const T& functor)
-      : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {}
+  template <class T>
+  Callback1(const T& functor)
+      : helper_(new RefCountedObject<HelperImpl<T> >(functor)) {}
   R operator()(P1 p1) {
     if (empty())
       return R();
@@ -117,25 +117,23 @@
     virtual ~Helper() {}
     virtual R Run(P1 p1) = 0;
   };
-  template <class T> struct HelperImpl : Helper {
+  template <class T>
+  struct HelperImpl : Helper {
     explicit HelperImpl(const T& functor) : functor_(functor) {}
-    virtual R Run(P1 p1) {
-      return functor_(p1);
-    }
+    virtual R Run(P1 p1) { return functor_(p1); }
     T functor_;
   };
   scoped_refptr<Helper> helper_;
 };
 
-template <class R,
-          class P1,
-          class P2>
+template <class R, class P1, class P2>
 class Callback2 {
  public:
   // Default copy operations are appropriate for this class.
   Callback2() {}
-  template <class T> Callback2(const T& functor)
-      : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {}
+  template <class T>
+  Callback2(const T& functor)
+      : helper_(new RefCountedObject<HelperImpl<T> >(functor)) {}
   R operator()(P1 p1, P2 p2) {
     if (empty())
       return R();
@@ -148,26 +146,23 @@
     virtual ~Helper() {}
     virtual R Run(P1 p1, P2 p2) = 0;
   };
-  template <class T> struct HelperImpl : Helper {
+  template <class T>
+  struct HelperImpl : Helper {
     explicit HelperImpl(const T& functor) : functor_(functor) {}
-    virtual R Run(P1 p1, P2 p2) {
-      return functor_(p1, p2);
-    }
+    virtual R Run(P1 p1, P2 p2) { return functor_(p1, p2); }
     T functor_;
   };
   scoped_refptr<Helper> helper_;
 };
 
-template <class R,
-          class P1,
-          class P2,
-          class P3>
+template <class R, class P1, class P2, class P3>
 class Callback3 {
  public:
   // Default copy operations are appropriate for this class.
   Callback3() {}
-  template <class T> Callback3(const T& functor)
-      : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {}
+  template <class T>
+  Callback3(const T& functor)
+      : helper_(new RefCountedObject<HelperImpl<T> >(functor)) {}
   R operator()(P1 p1, P2 p2, P3 p3) {
     if (empty())
       return R();
@@ -180,27 +175,23 @@
     virtual ~Helper() {}
     virtual R Run(P1 p1, P2 p2, P3 p3) = 0;
   };
-  template <class T> struct HelperImpl : Helper {
+  template <class T>
+  struct HelperImpl : Helper {
     explicit HelperImpl(const T& functor) : functor_(functor) {}
-    virtual R Run(P1 p1, P2 p2, P3 p3) {
-      return functor_(p1, p2, p3);
-    }
+    virtual R Run(P1 p1, P2 p2, P3 p3) { return functor_(p1, p2, p3); }
     T functor_;
   };
   scoped_refptr<Helper> helper_;
 };
 
-template <class R,
-          class P1,
-          class P2,
-          class P3,
-          class P4>
+template <class R, class P1, class P2, class P3, class P4>
 class Callback4 {
  public:
   // Default copy operations are appropriate for this class.
   Callback4() {}
-  template <class T> Callback4(const T& functor)
-      : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {}
+  template <class T>
+  Callback4(const T& functor)
+      : helper_(new RefCountedObject<HelperImpl<T> >(functor)) {}
   R operator()(P1 p1, P2 p2, P3 p3, P4 p4) {
     if (empty())
       return R();
@@ -213,7 +204,8 @@
     virtual ~Helper() {}
     virtual R Run(P1 p1, P2 p2, P3 p3, P4 p4) = 0;
   };
-  template <class T> struct HelperImpl : Helper {
+  template <class T>
+  struct HelperImpl : Helper {
     explicit HelperImpl(const T& functor) : functor_(functor) {}
     virtual R Run(P1 p1, P2 p2, P3 p3, P4 p4) {
       return functor_(p1, p2, p3, p4);
@@ -223,18 +215,14 @@
   scoped_refptr<Helper> helper_;
 };
 
-template <class R,
-          class P1,
-          class P2,
-          class P3,
-          class P4,
-          class P5>
+template <class R, class P1, class P2, class P3, class P4, class P5>
 class Callback5 {
  public:
   // Default copy operations are appropriate for this class.
   Callback5() {}
-  template <class T> Callback5(const T& functor)
-      : helper_(new RefCountedObject< HelperImpl<T> >(functor)) {}
+  template <class T>
+  Callback5(const T& functor)
+      : helper_(new RefCountedObject<HelperImpl<T> >(functor)) {}
   R operator()(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) {
     if (empty())
       return R();
@@ -247,7 +235,8 @@
     virtual ~Helper() {}
     virtual R Run(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) = 0;
   };
-  template <class T> struct HelperImpl : Helper {
+  template <class T>
+  struct HelperImpl : Helper {
     explicit HelperImpl(const T& functor) : functor_(functor) {}
     virtual R Run(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) {
       return functor_(p1, p2, p3, p4, p5);