Only install extensions into the main world

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 3618 matching lines @@
           RenderViewNavigatedToHost(GURL(GetLoadingUrl(frame)).host(),
                                     g_view_map.Get().size());
     }
   }
 }
 
 void RenderViewImpl::didClearWindowObject(WebFrame* frame, int world_id) {
   FOR_EACH_OBSERVER(RenderViewObserver, observers_,
                     DidClearWindowObject(frame, world_id));
 
-  if ((enabled_bindings_ & BINDINGS_POLICY_DOM_AUTOMATION) && (world_id == 0))
+  // Only install controllers into the main world.
+  if (!world_id)
+    return;
+
+  if (enabled_bindings_ & BINDINGS_POLICY_DOM_AUTOMATION))
     DomAutomationController::Install(this, frame);
 
   if (enabled_bindings_ & BINDINGS_POLICY_STATS_COLLECTION)
     StatsCollectionController::Install(frame);
 }
 
 void RenderViewImpl::didCreateDocumentElement(WebFrame* frame) {
   FOR_EACH_OBSERVER(RenderViewObserver, observers_,
                     DidCreateDocumentElement(frame));
 }
@@ skipping 2577 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