Add service registration for Mojo services defined under chrome/

chrome/browser/extensions/chrome_extension_web_contents_observer.h

Index: chrome/browser/extensions/chrome_extension_web_contents_observer.h
diff --git a/chrome/browser/extensions/chrome_extension_web_contents_observer.h b/chrome/browser/extensions/chrome_extension_web_contents_observer.h
index e50119984f276013694c2a0775832242b3d10d18..aa4173315278de1deee021a0dba498427c0490a0 100644
--- a/chrome/browser/extensions/chrome_extension_web_contents_observer.h
+++ b/chrome/browser/extensions/chrome_extension_web_contents_observer.h
@@ -35,6 +35,10 @@ class ChromeExtensionWebContentsObserver
   bool OnMessageReceived(const IPC::Message& message,
                          content::RenderFrameHost* render_frame_host) override;
 
+  // ExtensionWebContentsObserver override.
+  void RegisterMojoServices(content::RenderFrameHost* render_frame_host,
+                            const Extension* extension) override;
+
   // Adds a message to the extensions ErrorConsole.
   void OnDetailedConsoleMessageAdded(const base::string16& message,
                                      const base::string16& source,