Fix PP_FileOpenFlags_Dev handling:

content/browser/worker_host/worker_process_host.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 "content/browser/worker_host/worker_process_host.h"
 
 #include <set>
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 174 matching lines @@
       // PLATFORM_FILE_DELETE_ON_CLOSE are not granted, because no existing API
       // requests them.
       ChildProcessSecurityPolicy::GetInstance()->GrantPermissionsForFile(
           id(),
           resource_context_->file_system_context()->
               path_manager()->sandbox_provider()->base_path(),
           base::PLATFORM_FILE_OPEN |
           base::PLATFORM_FILE_CREATE |
           base::PLATFORM_FILE_OPEN_ALWAYS |
           base::PLATFORM_FILE_CREATE_ALWAYS |
+          base::PLATFORM_FILE_OPEN_TRUNCATED |
           base::PLATFORM_FILE_READ |
           base::PLATFORM_FILE_WRITE |
           base::PLATFORM_FILE_EXCLUSIVE_READ |
           base::PLATFORM_FILE_EXCLUSIVE_WRITE |
           base::PLATFORM_FILE_ASYNC |
-          base::PLATFORM_FILE_TRUNCATE |
           base::PLATFORM_FILE_WRITE_ATTRIBUTES);
   }
 
   // Call the embedder first so that their IPC filters have priority.
   content::GetContentClient()->browser()->WorkerProcessHostCreated(this);
   CreateMessageFilters(render_process_id);
 
   return true;
 }
 
@@ skipping 405 matching lines @@
     }
   }
   return false;
 }
 
 WorkerProcessHost::WorkerInstance::FilterInfo
 WorkerProcessHost::WorkerInstance::GetFilter() const {
   DCHECK(NumFilters() == 1);
   return *filters_.begin();
 }