Revert Change ServiceManagerConnectionImpl to run service request handlers on the IO thread

chrome/browser/chrome_content_browser_client.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 "chrome/browser/chrome_content_browser_client.h"
 
 #include <map>
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 3214 matching lines @@
           base::MakeUnique<PreferencesConnectionManager>());
     });
     info.task_runner = base::ThreadTaskRunnerHandle::Get();
     services->insert(std::make_pair(prefs::mojom::kServiceName, info));
   }
 
   if (!ash_util::IsRunningInMash()) {
     content::ServiceInfo info;
     info.factory = base::Bind(&ash_util::CreateEmbeddedAshService,
                               base::ThreadTaskRunnerHandle::Get());
-    info.task_runner = base::ThreadTaskRunnerHandle::Get();
     services->insert(std::make_pair(ash::mojom::kServiceName, info));
   }
 #endif  // OS_CHROMEOS
 }
 
 void ChromeContentBrowserClient::RegisterOutOfProcessServices(
       OutOfProcessServiceMap* services) {
 #if defined(ENABLE_MOJO_MEDIA_IN_UTILITY_PROCESS)
   services->insert(std::make_pair("media",
                                   base::ASCIIToUTF16("Media Service")));
@@ skipping 307 matching lines @@
     RedirectNonUINonIOBrowserThreadsToTaskScheduler() {
   return variations::GetVariationParamValue(
              "BrowserScheduler", "RedirectNonUINonIOBrowserThreads") == "true";
 }
 
 // static
 void ChromeContentBrowserClient::SetDefaultQuotaSettingsForTesting(
     const storage::QuotaSettings* settings) {
   g_default_quota_settings = settings;
 }