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

ppapi/proxy/plugin_globals.h

Index: ppapi/proxy/plugin_globals.h
diff --git a/ppapi/proxy/plugin_globals.h b/ppapi/proxy/plugin_globals.h
index fe24ed66d6f585ea297fc6bb45afba868ecbf33a..28cfe486dad4d6ebd05d9c0bc0b5deb0dbab94d0 100644
--- a/ppapi/proxy/plugin_globals.h
+++ b/ppapi/proxy/plugin_globals.h
@@ -44,7 +44,7 @@ class PPAPI_PROXY_EXPORT PluginGlobals : public PpapiGlobals {
   explicit PluginGlobals(const scoped_refptr<base::TaskRunner>& task_runner);
   PluginGlobals(PpapiGlobals::PerThreadForTest,
                 const scoped_refptr<base::TaskRunner>& task_runner);
-  virtual ~PluginGlobals();
+  ~PluginGlobals() override;
 
   // Getter for the global singleton. Generally, you should use
   // PpapiGlobals::Get() when possible. Use this only when you need some
@@ -57,28 +57,26 @@ class PPAPI_PROXY_EXPORT PluginGlobals : public PpapiGlobals {
   }
 
   // PpapiGlobals implementation.
-  virtual ResourceTracker* GetResourceTracker() override;
-  virtual VarTracker* GetVarTracker() override;
-  virtual CallbackTracker* GetCallbackTrackerForInstance(
+  ResourceTracker* GetResourceTracker() override;
+  VarTracker* GetVarTracker() override;
+  CallbackTracker* GetCallbackTrackerForInstance(PP_Instance instance) override;
+  thunk::PPB_Instance_API* GetInstanceAPI(PP_Instance instance) override;
+  thunk::ResourceCreationAPI* GetResourceCreationAPI(
       PP_Instance instance) override;
-  virtual thunk::PPB_Instance_API* GetInstanceAPI(
-      PP_Instance instance) override;
-  virtual thunk::ResourceCreationAPI* GetResourceCreationAPI(
-      PP_Instance instance) override;
-  virtual PP_Module GetModuleForInstance(PP_Instance instance) override;
-  virtual std::string GetCmdLine() override;
-  virtual void PreCacheFontForFlash(const void* logfontw) override;
-  virtual void LogWithSource(PP_Instance instance,
-                             PP_LogLevel level,
-                             const std::string& source,
-                             const std::string& value) override;
-  virtual void BroadcastLogWithSource(PP_Module module,
-                                      PP_LogLevel level,
-                                      const std::string& source,
-                                      const std::string& value) override;
-  virtual MessageLoopShared* GetCurrentMessageLoop() override;
+  PP_Module GetModuleForInstance(PP_Instance instance) override;
+  std::string GetCmdLine() override;
+  void PreCacheFontForFlash(const void* logfontw) override;
+  void LogWithSource(PP_Instance instance,
+                     PP_LogLevel level,
+                     const std::string& source,
+                     const std::string& value) override;
+  void BroadcastLogWithSource(PP_Module module,
+                              PP_LogLevel level,
+                              const std::string& source,
+                              const std::string& value) override;
+  MessageLoopShared* GetCurrentMessageLoop() override;
   base::TaskRunner* GetFileTaskRunner() override;
-  virtual void MarkPluginIsActive() override;
+  void MarkPluginIsActive() override;
 
   // Returns the channel for sending to the browser.
   IPC::Sender* GetBrowserSender();
@@ -159,7 +157,7 @@ class PPAPI_PROXY_EXPORT PluginGlobals : public PpapiGlobals {
   class BrowserSender;
 
   // PpapiGlobals overrides.
-  virtual bool IsPluginGlobals() const override;
+  bool IsPluginGlobals() const override;
 
   // Locks the proxy lock and releases the throttle on keepalive IPC messages.
   void OnReleaseKeepaliveThrottle();