Update {virtual,override,final} to follow C++11 style in base.

base/android/trace_event_binding.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/android/trace_event_binding.h"
 
 #include <jni.h>
 
 #include <set>
 
@@ skipping 39 matching lines @@
   jstring jname_;
   jstring jarg_;
   const char* name_;
   const char* arg_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceEventDataConverter);
 };
 
 class TraceEnabledObserver : public debug::TraceLog::EnabledStateObserver {
   public:
-    virtual void OnTraceLogEnabled() override {
+   void OnTraceLogEnabled() override {
       JNIEnv* env = base::android::AttachCurrentThread();
       base::android::Java_TraceEvent_setEnabled(env, true);
     }
-    virtual void OnTraceLogDisabled() override {
+    void OnTraceLogDisabled() override {
       JNIEnv* env = base::android::AttachCurrentThread();
       base::android::Java_TraceEvent_setEnabled(env, false);
     }
 };
 
 base::LazyInstance<TraceEnabledObserver>::Leaky g_trace_enabled_state_observer_;
 
 }  // namespace
 
 static void RegisterEnabledObserver(JNIEnv* env, jclass clazz) {
@@ skipping 63 matching lines @@
   TraceEventDataConverter converter(env, jname, nullptr);
   TRACE_EVENT_COPY_ASYNC_END0(kJavaCategory, converter.name(), jid);
 }
 
 bool RegisterTraceEvent(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace base