Add OVERRIDE to chrome/browser/extensions/.

chrome/browser/extensions/extension_debugger_api.h

Index: chrome/browser/extensions/extension_debugger_api.h
diff --git a/chrome/browser/extensions/extension_debugger_api.h b/chrome/browser/extensions/extension_debugger_api.h
index c7747979b79dd3d557044377f7da2a1a57be51f5..531e0e7ddbdc4aa92761850e49796b2467815a3e 100644
--- a/chrome/browser/extensions/extension_debugger_api.h
+++ b/chrome/browser/extensions/extension_debugger_api.h
@@ -40,7 +40,7 @@ class AttachDebuggerFunction : public DebuggerFunction {
  public:
   AttachDebuggerFunction();
   virtual ~AttachDebuggerFunction();
-  virtual bool RunImpl();
+  virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.debugger.attach")
 };
 
@@ -49,7 +49,7 @@ class DetachDebuggerFunction : public DebuggerFunction {
  public:
   DetachDebuggerFunction();
   virtual ~DetachDebuggerFunction();
-  virtual bool RunImpl();
+  virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.debugger.detach")
 };
 
@@ -58,7 +58,7 @@ class SendCommandDebuggerFunction : public DebuggerFunction {
  public:
   SendCommandDebuggerFunction();
   virtual ~SendCommandDebuggerFunction();
-  virtual bool RunImpl();
+  virtual bool RunImpl() OVERRIDE;
 
   void SendResponseBody(base::DictionaryValue* dictionary);
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.debugger.sendCommand")