Fixing WebRTC after moving from src/webrtc to src/

In https://webrtc-review.googlesource.com/c/src/+/1560 we moved WebRTC
from src/webrtc to src/ (in order to preserve an healthy git history).
This CL takes care of fixing header guards, #include paths, etc...

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
TBR=tommi@webrtc.org


Bug: chromium:611808
Change-Id: Iea91618212bee0af16aa3f05071eab8f93706578
Reviewed-on: https://webrtc-review.googlesource.com/1561
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19846}
diff --git a/rtc_base/unixfilesystem.cc b/rtc_base/unixfilesystem.cc
index 898fdd6..8355141 100644
--- a/rtc_base/unixfilesystem.cc
+++ b/rtc_base/unixfilesystem.cc
@@ -8,7 +8,7 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "webrtc/rtc_base/unixfilesystem.h"
+#include "rtc_base/unixfilesystem.h"
 
 #include <errno.h>
 #include <fcntl.h>
@@ -20,7 +20,7 @@
 #include <CoreServices/CoreServices.h>
 #include <IOKit/IOCFBundle.h>
 #include <sys/statvfs.h>
-#include "webrtc/rtc_base/macutils.h"
+#include "rtc_base/macutils.h"
 #endif  // WEBRTC_MAC && !defined(WEBRTC_IOS)
 
 #if defined(WEBRTC_POSIX) && !defined(WEBRTC_MAC) || defined(WEBRTC_IOS)
@@ -44,12 +44,12 @@
 #include <sys/syslimits.h>
 #endif
 
-#include "webrtc/rtc_base/arraysize.h"
-#include "webrtc/rtc_base/checks.h"
-#include "webrtc/rtc_base/fileutils.h"
-#include "webrtc/rtc_base/pathutils.h"
-#include "webrtc/rtc_base/stream.h"
-#include "webrtc/rtc_base/stringutils.h"
+#include "rtc_base/arraysize.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/fileutils.h"
+#include "rtc_base/pathutils.h"
+#include "rtc_base/stream.h"
+#include "rtc_base/stringutils.h"
 
 namespace rtc {