Simplify threading in browser thread by making only ChromeThread deal with di...

chrome/browser/extensions/sandboxed_extension_unpacker.cc

 // Copyright (c) 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.
 
 #include "chrome/browser/extensions/sandboxed_extension_unpacker.h"
 
 #include <set>
 
 #include "app/gfx/codec/png_codec.h"
 #include "base/crypto/signature_verifier.h"
@@ skipping 55 matching lines @@
   bool use_utility_process = rdh_ &&
       !CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess);
 
 #if defined(OS_POSIX)
     // TODO(port): Don't use a utility process on linux (crbug.com/22703) or
     // MacOS (crbug.com/8102) until problems related to autoupdate are fixed.
     use_utility_process = false;
 #endif
 
   if (use_utility_process) {
-    ChromeThread::GetMessageLoop(ChromeThread::IO)->PostTask(FROM_HERE,
-        NewRunnableMethod(this,
+    ChromeThread::PostTask(
+        ChromeThread::IO, FROM_HERE,
+        NewRunnableMethod(
+            this,
             &SandboxedExtensionUnpacker::StartProcessOnIOThread,
             temp_crx_path));
   } else {
     // Otherwise, unpack the extension in this process.
     ExtensionUnpacker unpacker(temp_crx_path);
     if (unpacker.Run() && unpacker.DumpImagesToFile())
       OnUnpackExtensionSucceeded(*unpacker.parsed_manifest());
     else
       OnUnpackExtensionFailed(unpacker.error_message());
   }
@@ skipping 212 matching lines @@
 
 void SandboxedExtensionUnpacker::ReportFailure(const std::string& error) {
   client_->OnUnpackFailure(error);
 }
 
 void SandboxedExtensionUnpacker::ReportSuccess() {
   // Client takes ownership of temporary directory and extension.
   client_->OnUnpackSuccess(temp_dir_.Take(), extension_root_,
                            extension_.release());
 }