Add the "virtual" keyword on method overrides that are missing it.

chrome/renderer/speech_input_dispatcher.h

Index: chrome/renderer/speech_input_dispatcher.h
diff --git a/chrome/renderer/speech_input_dispatcher.h b/chrome/renderer/speech_input_dispatcher.h
index 1af8f5d0a7dcc01365a88d6faf79f5abd13f923c..09133d25bf6cd83a27b7b9494e93e2a19508a4bb 100644
--- a/chrome/renderer/speech_input_dispatcher.h
+++ b/chrome/renderer/speech_input_dispatcher.h
@@ -31,13 +31,13 @@ class SpeechInputDispatcher : public WebKit::WebSpeechInputController {
   bool OnMessageReceived(const IPC::Message& msg);
 
   // WebKit::WebSpeechInputController.
-  bool startRecognition(int request_id,
-                        const WebKit::WebRect& element_rect,
-                        const WebKit::WebString& language,
-                        const WebKit::WebString& grammar);
+  virtual bool startRecognition(int request_id,
+                                const WebKit::WebRect& element_rect,
+                                const WebKit::WebString& language,
+                                const WebKit::WebString& grammar);
 
-  void cancelRecognition(int request_id);
-  void stopRecording(int request_id);
+  virtual void cancelRecognition(int request_id);
+  virtual void stopRecording(int request_id);
 
  private:
   void OnSpeechRecognitionResult(