Roll chromium_revision e144d30..6fdb142 (318658:318841) + remove OVERRIDE macro

Clang version changed 223108:230914
Details: https://chromium.googlesource.com/chromium/src/+/e144d30..6fdb142/tools/clang/scripts/update.sh

Removes the OVERRIDE macro defined in:
* webrtc/base/common.h
* webrtc/typedefs.h

The majority of the source changes were done by running this in src/:
perl -0pi -e "s/virtual\s([^({;]*(\([^({;]*\)[^({;]*))(OVERRIDE|override)/\1override/sg" `find {talk,webrtc} -name "*.h"  -o -name "*.cc*" -o -name "*.mm*"`

which converted all:
virtual Foo() OVERRIDE
functions to:
Foo() override

Then I manually edited:
* talk/media/webrtc/fakewebrtccommon.h
* webrtc/test/fake_common.h

Remaining uses of OVERRIDE was fixed by search+replace.

Manual edits were done to fix virtual destructors that were
overriding inherited ones.

Finally a build error related to the pure virtual definitions of
Read, Write and Rewind in common_types.h required a bit of
refactoring in:
* webrtc/common_types.cc
* webrtc/common_types.h
* webrtc/system_wrappers/interface/file_wrapper.h
* webrtc/system_wrappers/source/file_impl.cc

This roll should make it possible for us to finally re-enable deadlock
detection for TSan on the buildbots.

BUG=4106
R=pbos@webrtc.org, tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/41069004

Cr-Commit-Position: refs/heads/master@{#8596}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8596 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/talk/app/webrtc/dtmfsender_unittest.cc b/talk/app/webrtc/dtmfsender_unittest.cc
index 861a695..64f43e4 100644
--- a/talk/app/webrtc/dtmfsender_unittest.cc
+++ b/talk/app/webrtc/dtmfsender_unittest.cc
@@ -50,7 +50,7 @@
   FakeDtmfObserver() : completed_(false) {}
 
   // Implements DtmfSenderObserverInterface.
-  virtual void OnToneChange(const std::string& tone) OVERRIDE {
+  void OnToneChange(const std::string& tone) override {
     LOG(LS_VERBOSE) << "FakeDtmfObserver::OnToneChange '" << tone << "'.";
     tones_.push_back(tone);
     if (tone.empty()) {
@@ -90,12 +90,13 @@
   }
 
   // Implements DtmfProviderInterface.
-  virtual bool CanInsertDtmf(const std::string&  track_label) OVERRIDE {
+  bool CanInsertDtmf(const std::string& track_label) override {
     return (can_insert_dtmf_tracks_.count(track_label) != 0);
   }
 
-  virtual bool InsertDtmf(const std::string& track_label,
-                          int code, int duration) OVERRIDE {
+  bool InsertDtmf(const std::string& track_label,
+                  int code,
+                  int duration) override {
     int gap = 0;
     // TODO(ronghuawu): Make the timer (basically the rtc::TimeNanos)
     // mockable and use a fake timer in the unit tests.