Fix user scripts not getting initialized.

chrome/browser/renderer_host/browser_render_process_host.cc

 // Copyright (c) 2006-2009 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "chrome/browser/renderer_host/browser_render_process_host.h"
 
 #include "build/build_config.h"
@@ skipping 465 matching lines @@
   // TODO(aa): Should only bother sending these function names if this is an
   // extension process.
   std::vector<std::string> function_names;
   ExtensionFunctionDispatcher::GetAllFunctionNames(&function_names);
   Send(new ViewMsg_Extension_SetFunctionNames(function_names));
 }
 
 void BrowserRenderProcessHost::SendUserScriptsUpdate(
     base::SharedMemory *shared_memory) {
   base::SharedMemoryHandle handle_for_process;
-  bool r = shared_memory->ShareToProcess(GetRendererProcessHandle(),
-                                         &handle_for_process);
-  DCHECK(r);
+  if (!shared_memory->ShareToProcess(GetRendererProcessHandle(),
+                                     &handle_for_process)) {
+    // This can legitimately fail if the renderer asserts at startup.
+    return;
+  }
+
   if (base::SharedMemory::IsHandleValid(handle_for_process)) {
     channel_->Send(new ViewMsg_UserScripts_UpdatedScripts(handle_for_process));
   }
 }
 
 bool BrowserRenderProcessHost::FastShutdownIfPossible() {
   if (!process_.handle())
     return false;  // Render process is probably crashed.
   if (BrowserRenderProcessHost::run_renderer_in_process())
     return false;  // Since process mode can't do fast shutdown.
@@ skipping 319 matching lines @@
   ExtensionMessageService* ems = ExtensionMessageService::GetInstance(context);
   ems->AddEventListener(event_name, pid());
 }
 
 void BrowserRenderProcessHost::OnExtensionRemoveListener(
     const std::string& event_name) {
   URLRequestContext* context = profile()->GetRequestContext();
   ExtensionMessageService* ems = ExtensionMessageService::GetInstance(context);
   ems->RemoveEventListener(event_name, pid());
 }