Replace scoped_ptr with unique_ptr everywhere

But keep #including scoped_ptr.h in .h files, so as not to break
WebRTC users who expect those .h files to give them rtc::scoped_ptr.

BUG=webrtc:5520

Review-Url: https://codereview.webrtc.org/1937693002
Cr-Commit-Position: refs/heads/master@{#12581}
diff --git a/webrtc/system_wrappers/source/aligned_malloc_unittest.cc b/webrtc/system_wrappers/source/aligned_malloc_unittest.cc
index 3933c2a..ed6cd42 100644
--- a/webrtc/system_wrappers/source/aligned_malloc_unittest.cc
+++ b/webrtc/system_wrappers/source/aligned_malloc_unittest.cc
@@ -10,6 +10,8 @@
 
 #include "webrtc/system_wrappers/include/aligned_malloc.h"
 
+#include <memory>
+
 #if _WIN32
 #include <windows.h>
 #else
@@ -17,14 +19,13 @@
 #endif
 
 #include "testing/gtest/include/gtest/gtest.h"
-#include "webrtc/base/scoped_ptr.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 
 // Returns true if |size| and |alignment| are valid combinations.
 bool CorrectUsage(size_t size, size_t alignment) {
-  rtc::scoped_ptr<char, AlignedFreeDeleter> scoped(
+  std::unique_ptr<char, AlignedFreeDeleter> scoped(
       static_cast<char*>(AlignedMalloc(size, alignment)));
   if (scoped.get() == NULL) {
     return false;
@@ -37,7 +38,7 @@
   const size_t size = 100;
   const size_t alignment = 32;
   const size_t left_misalignment = 1;
-  rtc::scoped_ptr<char, AlignedFreeDeleter> scoped(
+  std::unique_ptr<char, AlignedFreeDeleter> scoped(
       static_cast<char*>(AlignedMalloc(size, alignment)));
   EXPECT_TRUE(scoped.get() != NULL);
   const uintptr_t aligned_address = reinterpret_cast<uintptr_t> (scoped.get());