Use OAuth2AccessTokenFetcher implementation on Android.

google_apis/gaia/oauth2_token_service.cc

 // Copyright 2013 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 "google_apis/gaia/oauth2_token_service.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 326 matching lines @@
 void OAuth2TokenService::Fetcher::AddWaitingRequest(
     base::WeakPtr<OAuth2TokenService::RequestImpl> waiting_request) {
   waiting_requests_.push_back(waiting_request);
 }
 
 size_t OAuth2TokenService::Fetcher::GetWaitingRequestCount() const {
   return waiting_requests_.size();
 }
 
 void OAuth2TokenService::Fetcher::Cancel() {
+  if (fetcher_)
+    fetcher_->CancelRequest();
   fetcher_.reset();
   retry_timer_.Stop();
   error_ = GoogleServiceAuthError(GoogleServiceAuthError::REQUEST_CANCELED);
   InformWaitingRequestsAndDelete();
 }
 
 const OAuth2TokenService::ScopeSet& OAuth2TokenService::Fetcher::GetScopeSet()
     const {
   return scopes_;
 }
@@ skipping 440 matching lines @@
     const std::string& account_id,
     const ScopeSet& scopes) const {
   PendingFetcherMap::const_iterator iter = pending_fetchers_.find(
       OAuth2TokenService::RequestParameters(
           client_id,
           account_id,
           scopes));
   return iter == pending_fetchers_.end() ?
              0 : iter->second->GetWaitingRequestCount();
 }