[Mac] Finish up extension infobar UI implementation.

chrome/browser/cocoa/extensions/extension_infobar_controller.h

Index: chrome/browser/cocoa/extensions/extension_infobar_controller.h
===================================================================
--- chrome/browser/cocoa/extensions/extension_infobar_controller.h	(revision 52101)
+++ chrome/browser/cocoa/extensions/extension_infobar_controller.h	(working copy)
@@ -9,12 +9,30 @@
 
 #import <Cocoa/Cocoa.h>
 
+#import "base/scoped_nsobject.h"
+#include "base/scoped_ptr.h"
+
+@class ExtensionActionContextMenu;
+class ExtensionInfoBarDelegate;
+class InfobarBridge;
+@class MenuButton;
+
 @interface ExtensionInfoBarController : InfoBarController {
   // The native extension view retrieved from the extension host. Weak.
   NSView* extensionView_;
 
   // The window containing this InfoBar. Weak.
   NSWindow* window_;
+
+  // The InfoBar's button with the Extension's icon that launches the context
+  // menu.
+  scoped_nsobject<MenuButton> dropdownButton_;
+
+  // The context menu that pops up when the left button is clicked.
+  scoped_nsobject<ExtensionActionContextMenu> contextMenu_;
+
+  // Helper class to bridge C++ and ObjC functionality together for the infobar.
+  scoped_ptr<InfobarBridge> bridge_;
 }
 
 @end