Turn the flag off and see what happens

content/renderer/render_view_impl.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 "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 938 matching lines @@
       ShouldUseTransitionCompositing(device_scale_factor_));
   webview()->settings()->setAcceleratedCompositingForFixedRootBackgroundEnabled(
       ShouldUseAcceleratedFixedRootBackground(device_scale_factor_));
   webview()->settings()->setAcceleratedCompositingForScrollableFramesEnabled(
       ShouldUseAcceleratedCompositingForScrollableFrames(device_scale_factor_));
   webview()->settings()->setCompositedScrollingForFramesEnabled(
       ShouldUseCompositedScrollingForFrames(device_scale_factor_));
 
   ApplyWebPreferences(webkit_preferences_, webview());
 
-  main_render_frame_.reset(
-      RenderFrameImpl::Create(this, params->main_frame_routing_id));
+  main_render_frame_ =
+      RenderFrameImpl::Create(this, params->main_frame_routing_id);
   // The main frame WebFrame object is closed by
   // RenderViewImpl::frameDetached().
-  webview()->setMainFrame(WebFrame::create(main_render_frame_.get()));
+  webview()->setMainFrame(WebFrame::create(main_render_frame_));
 
   if (switches::IsTouchDragDropEnabled())
     webview()->settings()->setTouchDragDropEnabled(true);
 
   if (switches::IsTouchEditingEnabled())
     webview()->settings()->setTouchEditingEnabled(true);
 
   if (!params->frame_name.empty())
     webview()->mainFrame()->setName(params->frame_name);
 
@@ skipping 1544 matching lines @@
   int id = enumeration_completion_id_++;
   enumeration_completions_[id] = chooser_completion;
   return Send(new ViewHostMsg_EnumerateDirectory(
       routing_id_,
       id,
       base::FilePath::FromUTF16Unsafe(path)));
 }
 
 void RenderViewImpl::initializeHelperPluginWebFrame(
     WebKit::WebHelperPlugin* plugin) {
-  plugin->initializeFrame(main_render_frame_.get());
+  plugin->initializeFrame(main_render_frame_);
 }
 
 void RenderViewImpl::didStartLoading() {
   if (is_loading_) {
     DVLOG(1) << "didStartLoading called while loading";
     return;
   }
 
   is_loading_ = true;
 
@@ skipping 4052 matching lines @@
   for (size_t i = 0; i < icon_urls.size(); i++) {
     WebURL url = icon_urls[i].iconURL();
     if (!url.isEmpty())
       urls.push_back(FaviconURL(url,
                                 ToFaviconType(icon_urls[i].iconType())));
   }
   SendUpdateFaviconURL(urls);
 }
 
 }  // namespace content