Reduce/remove usage of BrowserThread in content/browser/loader.

content/browser/loader/async_resource_handler_unittest.cc

 // Copyright 2016 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/loader/async_resource_handler.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <memory>
 #include <string>
@@ skipping 83 matching lines @@
  public:
   RecordingResourceMessageFilter(ResourceContext* resource_context,
                                  net::URLRequestContext* request_context)
       : ResourceMessageFilter(
             0,
             nullptr,
             nullptr,
             nullptr,
             nullptr,
             base::Bind(&RecordingResourceMessageFilter::GetContexts,
-                       base::Unretained(this))),
+                       base::Unretained(this)),
+            BrowserThread::GetTaskRunnerForThread(BrowserThread::IO)),
         resource_context_(resource_context),
         request_context_(request_context) {
     InitializeForTest();
     set_peer_process_for_testing(base::Process::Current());
   }
 
   const std::vector<std::unique_ptr<IPC::Message>>& messages() const {
     return messages_;
   }
 
@@ skipping 182 matching lines @@
   ResourceRequestCompletionStatus completion_status =
       std::get<1>(completion_params);
   EXPECT_EQ(TotalReceivedBytes(kDataSize),
             completion_status.encoded_data_length);
   EXPECT_EQ(kDataSize, completion_status.encoded_body_length);
 }
 
 }  // namespace
 
 }  // namespace content