Replace OVERRIDE and FINAL with override and final in content/public/[a-s]*

content/public/renderer/platform_event_observer.h

Index: content/public/renderer/platform_event_observer.h
diff --git a/content/public/renderer/platform_event_observer.h b/content/public/renderer/platform_event_observer.h
index e14263ecbd2a6df9f13e6c5a8edc6bbc482f87d1..6d569227af63816ad0b36116d2c8a95cd600f53f 100644
--- a/content/public/renderer/platform_event_observer.h
+++ b/content/public/renderer/platform_event_observer.h
@@ -71,7 +71,7 @@ class PlatformEventObserver : public PlatformEventObserverBase,
 
   // Called when a new IPC message is received. Must be used to listen to the
   // responses from the browser process if any expected.
-  virtual bool OnControlMessageReceived(const IPC::Message& msg) OVERRIDE {
+  virtual bool OnControlMessageReceived(const IPC::Message& msg) override {
     return false;
   }