RenderView needs to know zoom level for loading pages.

content/renderer/render_frame_impl.cc

 // Copyright 2013 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 "content/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 4465 matching lines @@
     HostZoomLevels::iterator host_zoom =
         render_view_->host_zoom_levels_.find(GURL(request.url()));
     if (render_view_->webview()->mainFrame()->isWebLocalFrame() &&
         render_view_->webview()->mainFrame()->document().isPluginDocument()) {
       // Reset the zoom levels for plugins.
       render_view_->webview()->setZoomLevel(0);
     } else {
       // If the zoom level is not found, then do nothing. In-page navigation
       // relies on not changing the zoom level in this case.
       if (host_zoom != render_view_->host_zoom_levels_.end())
-        render_view_->webview()->setZoomLevel(host_zoom->second);
+        render_view_->SetZoomLevel(host_zoom->second);
     }
 
     if (host_zoom != render_view_->host_zoom_levels_.end()) {
       // This zoom level was merely recorded transiently for this load.  We can
       // erase it now.  If at some point we reload this page, the browser will
       // send us a new, up-to-date zoom level.
       render_view_->host_zoom_levels_.erase(host_zoom);
     }
 
     // Update contents MIME type for main frame.
@@ skipping 1530 matching lines @@
                                     int match_count,
                                     int ordinal,
                                     const WebRect& selection_rect,
                                     bool final_status_update) {
   Send(new FrameHostMsg_Find_Reply(routing_id_, request_id, match_count,
                                    selection_rect, ordinal,
                                    final_status_update));
 }
 
 }  // namespace content