Get rid of extensions dependency from content\browser.

chrome/browser/ui/cocoa/extensions/extension_infobar_controller.mm

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/extensions/extension_infobar_controller.h"
 
 #include <cmath>
 
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_infobar_delegate.h"
+#include "chrome/browser/extensions/image_loading_tracker.h"
 #import "chrome/browser/ui/cocoa/animatable_view.h"
 #import "chrome/browser/ui/cocoa/extensions/extension_action_context_menu.h"
 #import "chrome/browser/ui/cocoa/menu_button.h"
 #include "chrome/browser/ui/cocoa/infobars/infobar.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_icon_set.h"
 #include "chrome/common/extensions/extension_resource.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "grit/theme_resources.h"
 #include "skia/ext/skia_utils_mac.h"
@@ skipping 237 matching lines @@
 
 @end
 
 InfoBar* ExtensionInfoBarDelegate::CreateInfoBar() {
   NSWindow* window = [(NSView*)tab_contents_->GetContentNativeView() window];
   ExtensionInfoBarController* controller =
       [[ExtensionInfoBarController alloc] initWithDelegate:this
                                                     window:window];
   return new InfoBar(controller);
 }