Switch ZoomTabHelper to use WebContentsUserData.

chrome/browser/ui/gtk/location_bar_view_gtk.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/ui/gtk/location_bar_view_gtk.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 1553 matching lines @@
 
   if (can_show_bubble && gtk_widget_get_visible(zoom_.get()))
     ShowZoomBubble();
 }
 
 void LocationBarViewGtk::UpdateZoomIcon() {
   TabContents* tab_contents = GetTabContents();
   if (!zoom_.get() || !tab_contents)
     return;
 
-  ZoomController* zoom_controller = tab_contents->zoom_controller();
+  ZoomController* zoom_controller =
+      ZoomController::FromWebContents(tab_contents->web_contents());
   if (!zoom_controller || zoom_controller->IsAtDefaultZoom() ||
       toolbar_model_->input_in_progress()) {
     gtk_widget_hide(zoom_.get());
     ZoomBubbleGtk::Close();
     return;
   }
 
   const int zoom_resource = zoom_controller->GetResourceForZoomLevel();
   gtk_image_set_from_pixbuf(GTK_IMAGE(zoom_image_),
       theme_service_->GetImageNamed(zoom_resource)->ToGdkPixbuf());
@@ skipping 550 matching lines @@
 }
 
 void LocationBarViewGtk::PageActionViewGtk::InspectPopup(
     ExtensionAction* action) {
   ExtensionPopupGtk::Show(
       action->GetPopupUrl(current_tab_id_),
       owner_->browser_,
       event_box_.get(),
       ExtensionPopupGtk::SHOW_AND_INSPECT);
 }