Fix ChromeRenderViewObserver::DidStopLoading to be OOPIF compatible.

chrome/renderer/chrome_render_view_observer.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/renderer/chrome_render_view_observer.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 316 matching lines @@
     for (size_t i = 0; i < webui_javascript_.size(); ++i) {
       render_view()->GetMainRenderFrame()->ExecuteJavaScript(
           webui_javascript_[i]);
     }
     webui_javascript_.clear();
   }
 }
 
 void ChromeRenderViewObserver::DidStopLoading() {
   WebFrame* main_frame = render_view()->GetWebView()->mainFrame();
+
+  // Remote frames don't host a document, so return early if that's the case.
+  if (main_frame->isWebRemoteFrame())
+    return;
+
   GURL osdd_url = main_frame->document().openSearchDescriptionURL();
   if (!osdd_url.is_empty()) {
     Send(new ChromeViewHostMsg_PageHasOSDD(
         routing_id(), main_frame->document().url(), osdd_url,
         search_provider::AUTODETECTED_PROVIDER));
   }
 
   // Don't capture pages including refresh meta tag.
   if (HasRefreshMetaTag(main_frame))
     return;
@@ skipping 125 matching lines @@
     WebElement element = node.to<WebElement>();
     if (!element.hasHTMLTagName(tag_name))
       continue;
     WebString value = element.getAttribute(attribute_name);
     if (value.isNull() || !LowerCaseEqualsASCII(value, "refresh"))
       continue;
     return true;
   }
   return false;
 }