This patch caused Chrome to be unable to load any web pages on Chrome OS.

chrome/browser/automation/automation_provider.cc

 // Copyright (c) 2011 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/browser/automation/automation_provider.h"
 
 #include <set>
 
 #include "base/callback.h"
 #include "base/command_line.h"
@@ skipping 145 matching lines @@
   }
 
   if (!automation_resource_message_filter_.get()) {
     automation_resource_message_filter_ = new AutomationResourceMessageFilter;
   }
 
   channel_.reset(new IPC::ChannelProxy(
       effective_channel_id,
       GetChannelMode(use_named_interface),
       this,
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO),
-      false /* needs_override_peer_pid */));
+      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO)));
   channel_->AddFilter(automation_resource_message_filter_);
 
 #if defined(OS_CHROMEOS)
   // Wait for the network manager to initialize.
   // The observer will delete itself when done.
   network_library_initialized_ = false;
   NetworkManagerInitObserver* observer = new NetworkManagerInitObserver(this);
   if (!observer->Init())
     delete observer;
 #endif
@@ skipping 767 matching lines @@
     }
   }
 }
 
 void AutomationProvider::SaveAsAsync(int tab_handle) {
   NavigationController* tab = NULL;
   TabContents* tab_contents = GetTabContentsForHandle(tab_handle, &tab);
   if (tab_contents)
     tab_contents->OnSavePage();
 }