[Cronet] Hook up library loader, system proxy and network change notifier to async api.

components/cronet/android/cronet_url_request_adapter.cc

 // Copyright 2014 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 "cronet_url_request_adapter.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "components/cronet/android/cronet_url_request_context_adapter.h"
@@ skipping 29 matching lines @@
                                                const std::string& value) {
   DCHECK(!IsOnNetworkThread());
   initial_request_headers_.SetHeader(name, value);
 }
 
 void CronetURLRequestAdapter::DisableCache() {
   DCHECK(!IsOnNetworkThread());
   load_flags_ |= net::LOAD_DISABLE_CACHE;
 }
 
-bool CronetURLRequestAdapter::PostTaskToNetworkThread(
+void CronetURLRequestAdapter::PostTaskToNetworkThread(
     const tracked_objects::Location& from_here,
     const base::Closure& task) {
   DCHECK(!IsOnNetworkThread());
-  return context_->GetNetworkTaskRunner()->PostTask(from_here, task);
+  context_->PostTaskToNetworkThread(from_here, task);
 }
 
 bool CronetURLRequestAdapter::IsOnNetworkThread() const {
-  return context_->GetNetworkTaskRunner()->BelongsToCurrentThread();
+  return context_->IsOnNetworkThread();
 }
 
 void CronetURLRequestAdapter::Start() {
   DCHECK(IsOnNetworkThread());
   VLOG(1) << "Starting chromium request: "
           << initial_url_.possibly_invalid_spec().c_str()
           << " priority: " << RequestPriorityToString(initial_priority_);
   url_request_ = context_->GetURLRequestContext()->CreateRequest(
       initial_url_, net::DEFAULT_PRIORITY, this, NULL);
   url_request_->SetLoadFlags(load_flags_);
@@ skipping 86 matching lines @@
   DCHECK_EQ(request, url_request_);
   if (url_request_->status().is_success())
     return false;
   VLOG(1) << "Error " << url_request_->status().error()
           << " on chromium request: " << initial_url_.possibly_invalid_spec();
   delegate_->OnError(url_request_->status().error());
   return true;
 }
 
 }  // namespace cronet