Introduce TranslateService and TranslateDownloadManager

components/translate/core/browser/translate_url_fetcher.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 "components/translate/core/browser/translate_url_fetcher.h"
 
-#include "components/translate/core/browser/translate_delegate.h"
+#include "components/translate/core/browser/translate_download_manager.h"
 #include "net/base/load_flags.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_request_status.h"
 
 namespace {
 
 // Retry parameter for fetching.
 const int kMaxRetry = 16;
 
 }  // namespace
 
-TranslateURLFetcher::TranslateURLFetcher(int id, TranslateDelegate* delegate)
-    : id_(id),
-      translate_delegate_(delegate),
-      state_(IDLE),
-      retry_count_(0) {
+TranslateURLFetcher::TranslateURLFetcher(int id) : id_(id),
+                                                   state_(IDLE),
+                                                   retry_count_(0) {
 }
 
 TranslateURLFetcher::~TranslateURLFetcher() {
 }
 
 bool TranslateURLFetcher::Request(
     const GURL& url,
     const TranslateURLFetcher::Callback& callback) {
   // This function is not supposed to be called before previous operaion is not
   // finished.
@@ skipping 10 matching lines @@
   url_ = url;
   callback_ = callback;
 
   fetcher_.reset(net::URLFetcher::Create(
       id_,
       url_,
       net::URLFetcher::GET,
       this));
   fetcher_->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
                          net::LOAD_DO_NOT_SAVE_COOKIES);
-  fetcher_->SetRequestContext(translate_delegate_->GetURLRequestContext());
+  fetcher_->SetRequestContext(
+      TranslateDownloadManager::GetInstance()->request_context());
   // Set retry parameter for HTTP status code 5xx. This doesn't work against
   // 106 (net::ERR_INTERNET_DISCONNECTED) and so on.
   // TranslateLanguageList handles network status, and implements retry.
   fetcher_->SetMaxRetriesOn5xx(max_retry_on_5xx_);
   if (!extra_request_header_.empty())
     fetcher_->SetExtraRequestHeaders(extra_request_header_);
 
   fetcher_->Start();
 
   return true;
 }
 
 void TranslateURLFetcher::OnURLFetchComplete(const net::URLFetcher* source) {
   DCHECK(fetcher_.get() == source);
 
   std::string data;
   if (source->GetStatus().status() == net::URLRequestStatus::SUCCESS &&
       source->GetResponseCode() == net::HTTP_OK) {
     state_ = COMPLETED;
     source->GetResponseAsString(&data);
   } else {
     state_ = FAILED;
   }
 
   // Transfer URLFetcher's ownership before invoking a callback.
   scoped_ptr<const net::URLFetcher> delete_ptr(fetcher_.release());
   callback_.Run(id_, state_ == COMPLETED, data);
 }