Add OVERRIDE to chrome/browser/extensions/.

chrome/browser/extensions/extension_clipboard_api.h

Index: chrome/browser/extensions/extension_clipboard_api.h
diff --git a/chrome/browser/extensions/extension_clipboard_api.h b/chrome/browser/extensions/extension_clipboard_api.h
index e12839153d5969041b4f8aba2664fd594c4b2157..3687ca29467a9f7d0d16b4dd6ff0442eb74f2548 100644
--- a/chrome/browser/extensions/extension_clipboard_api.h
+++ b/chrome/browser/extensions/extension_clipboard_api.h
@@ -13,7 +13,7 @@
 // Currently, only writing to standard buffer is possible.
 class WriteDataClipboardFunction : public SyncExtensionFunction {
  public:
-  virtual bool RunImpl();
+  virtual bool RunImpl() OVERRIDE;
 
  private:
   // Writes plain text to the buffer. Ignores url argument if sent from the
@@ -29,7 +29,7 @@ class WriteDataClipboardFunction : public SyncExtensionFunction {
 // are specified by parameters passed from the extension.
 class ReadDataClipboardFunction : public SyncExtensionFunction {
  public:
-  virtual bool RunImpl();
+  virtual bool RunImpl() OVERRIDE;
 
  private:
   // Reads plain text from the clipboard buffer. Callback will have only data
@@ -44,7 +44,7 @@ class ReadDataClipboardFunction : public SyncExtensionFunction {
 // For a given clipbord buffer, returns list of data types available on it.
 class GetAvailableMimeTypesClipboardFunction : public SyncExtensionFunction {
  public:
-  virtual bool RunImpl();
+  virtual bool RunImpl() OVERRIDE;
  private:
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.clipboard.getAvailableTypes")
 };