base: Stop passing a non-const ref to ObserverListBase::Iterator.

content/browser/web_contents/web_contents_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/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 491 matching lines @@
 
 bool WebContentsImpl::OnMessageReceived(RenderViewHost* render_view_host,
                                         RenderFrameHost* render_frame_host,
                                         const IPC::Message& message) {
   DCHECK(render_view_host || render_frame_host);
   if (GetWebUI() &&
       static_cast<WebUIImpl*>(GetWebUI())->OnMessageReceived(message)) {
     return true;
   }
 
-  ObserverListBase<WebContentsObserver>::Iterator it(observers_);
+  ObserverListBase<WebContentsObserver>::Iterator it(&observers_);
   WebContentsObserver* observer;
   if (render_frame_host) {
     while ((observer = it.GetNext()) != NULL)
       if (observer->OnMessageReceived(message, render_frame_host))
         return true;
   } else {
     while ((observer = it.GetNext()) != NULL)
       if (observer->OnMessageReceived(message))
         return true;
   }
@@ skipping 4033 matching lines @@
   node->render_manager()->ResumeResponseDeferredAtStart();
 }
 
 void WebContentsImpl::SetForceDisableOverscrollContent(bool force_disable) {
   force_disable_overscroll_content_ = force_disable;
   if (view_)
     view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 }
 
 }  // namespace content