Add OVERRIDE to content/.

BUG=104314
TEST=no change

Review URL: http://codereview.chromium.org/8587009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110544 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/browser/plugin_loader_posix.h b/content/browser/plugin_loader_posix.h
index b99a17a..b69ad89 100644
--- a/content/browser/plugin_loader_posix.h
+++ b/content/browser/plugin_loader_posix.h
@@ -57,7 +57,7 @@
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // IPC::Message::Sender:
-  virtual bool Send(IPC::Message* msg);
+  virtual bool Send(IPC::Message* msg) OVERRIDE;
 
  private:
   struct PendingCallback {