Create a TrivialURLRequestContextGetter to shim an existing URLRequestContext.

net/url_request/url_request_context_getter.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 "net/url_request/url_request_context_getter.h"
 
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "net/url_request/url_request_context.h"
 
@@ skipping 17 matching lines @@
         // aid in debugging.
         DLOG(WARNING) << "URLRequestContextGetter leaking due to no owning"
                       << " thread.";
       }
     }
   }
   // If no IO message loop proxy was available, we will just leak memory.
   // This is also true if the IO thread is gone.
 }
 
+TrivialURLRequestContextGetter::TrivialURLRequestContextGetter(
+    net::URLRequestContext* context,
+    const scoped_refptr<base::SingleThreadTaskRunner>& main_task_runner)
+    : context_(context), main_task_runner_(main_task_runner) {}
+
+TrivialURLRequestContextGetter::~TrivialURLRequestContextGetter() {}
+
+net::URLRequestContext*
+TrivialURLRequestContextGetter::GetURLRequestContext() {
+  return context_;
+}
+
+scoped_refptr<base::SingleThreadTaskRunner>
+TrivialURLRequestContextGetter::GetNetworkTaskRunner() const {
+  return main_task_runner_;
+}
+
+
 }  // namespace net