Add OVERRIDE to chrome/browser/ui/webui/.

chrome/browser/ui/webui/extension_icon_source.h

Index: chrome/browser/ui/webui/extension_icon_source.h
diff --git a/chrome/browser/ui/webui/extension_icon_source.h b/chrome/browser/ui/webui/extension_icon_source.h
index 0e1e679ab62c35e8113b9ea4d25f0009be6aecaa..4a839c703e0f93d6c39a47fc09a3af10aa2e467d 100644
--- a/chrome/browser/ui/webui/extension_icon_source.h
+++ b/chrome/browser/ui/webui/extension_icon_source.h
@@ -68,11 +68,11 @@ class ExtensionIconSource : public ChromeURLDataManager::DataSource,
 
   // ChromeURLDataManager::DataSource
 
-  virtual std::string GetMimeType(const std::string&) const;
+  virtual std::string GetMimeType(const std::string&) const OVERRIDE;
 
   virtual void StartDataRequest(const std::string& path,
                                 bool is_incognito,
-                                int request_id);
+                                int request_id) OVERRIDE;
 
  private:
   // Encapsulates the request parameters for |request_id|.
@@ -116,7 +116,7 @@ class ExtensionIconSource : public ChromeURLDataManager::DataSource,
   // ImageLoadingTracker::Observer
   virtual void OnImageLoaded(SkBitmap* image,
                              const ExtensionResource& resource,
-                             int id);
+                             int id) OVERRIDE;
 
   // Called when the extension doesn't have an icon. We fall back to multiple
   // sources, using the following order: