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

content/browser/loader/resource_loader.h

 // 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.
 
 #ifndef CONTENT_BROWSER_LOADER_RESOURCE_LOADER_H_
 #define CONTENT_BROWSER_LOADER_RESOURCE_LOADER_H_
 
 #include <memory>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/threading/thread_checker.h"
 #include "base/time/time.h"
 #include "content/browser/loader/resource_controller.h"
 #include "content/browser/loader/resource_handler.h"
 #include "content/browser/ssl/ssl_client_auth_handler.h"
 #include "content/browser/ssl/ssl_error_handler.h"
 #include "content/common/content_export.h"
 #include "net/url_request/url_request.h"
 #include "url/gurl.h"
 
 namespace net {
@@ skipping 146 matching lines @@
   int times_cancelled_after_request_start_;
 
   // Stores the URL from a deferred redirect.
   GURL deferred_redirect_url_;
 
   // Read buffer and its size.  Class members as OnWillRead can complete
   // asynchronously.
   scoped_refptr<net::IOBuffer> read_buffer_;
   int read_buffer_size_;
 
+  base::ThreadChecker thread_checker_;
+
   base::WeakPtrFactory<ResourceLoader> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceLoader);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_LOADER_H_