Stop calling Platform::shutdown when a PPAPI/utility thread stop

content/ppapi_plugin/ppapi_thread.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/ppapi_plugin/ppapi_thread.h"
 
 #include <stddef.h>
 
 #include <limits>
 
@@ skipping 127 matching lines @@
 PpapiThread::~PpapiThread() {
 }
 
 void PpapiThread::Shutdown() {
   ChildThreadImpl::Shutdown();
 
   ppapi::proxy::PluginGlobals::Get()->ResetPluginProxyDelegate();
   if (plugin_entry_points_.shutdown_module)
     plugin_entry_points_.shutdown_module();
   blink_platform_impl_->Shutdown();
-  blink::Platform::shutdown();
 }
 
 bool PpapiThread::Send(IPC::Message* msg) {
   // Allow access from multiple threads.
   if (message_loop()->task_runner()->BelongsToCurrentThread())
     return ChildThreadImpl::Send(msg);
 
   return sync_message_filter()->Send(msg);
 }
 
@@ skipping 429 matching lines @@
           GetHistogramName(is_broker_, "LoadTime", path),
           base::TimeDelta::FromMilliseconds(1),
           base::TimeDelta::FromSeconds(10),
           50,
           base::HistogramBase::kUmaTargetedHistogramFlag);
 
   histogram->AddTime(load_time);
 }
 
 }  // namespace content