<webview>: Support zoom in WebUI

chrome/browser/ui/gtk/zoom_bubble_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/zoom_bubble_gtk.h"
 
 #include "base/i18n/rtl.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 201 matching lines @@
 
 void ZoomBubbleGtk::OnDestroy(GtkWidget* widget) {
   // Listen to the destroy signal and delete this instance when it is caught.
   delete this;
 }
 
 void ZoomBubbleGtk::OnSetDefaultLinkClick(GtkWidget* widget) {
   double default_zoom_level = Profile::FromBrowserContext(
       web_contents_->GetBrowserContext())->GetPrefs()->GetDouble(
           prefs::kDefaultZoomLevel);
-  web_contents_->GetRenderViewHost()->SetZoomLevel(default_zoom_level);
+  web_contents_->SetZoomLevel(default_zoom_level);
 }
 
 gboolean ZoomBubbleGtk::OnMouseEnter(GtkWidget* widget,
                                      GdkEventCrossing* event) {
   mouse_inside_ = true;
   StopTimerIfNecessary();
   return FALSE;
 }
 
 gboolean ZoomBubbleGtk::OnMouseLeave(GtkWidget* widget,
                                      GdkEventCrossing* event) {
   mouse_inside_ = false;
   StartTimerIfNecessary();
   return FALSE;
 }
 
 void ZoomBubbleGtk::Observe(int type,
                             const content::NotificationSource& source,
                             const content::NotificationDetails& details) {
   DCHECK_EQ(type, chrome::NOTIFICATION_FULLSCREEN_CHANGED);
   CloseBubble();
 }