Introduce TranslateService and TranslateDownloadManager

components/translate/core/browser/translate_url_fetcher.cc

Index: components/translate/core/browser/translate_url_fetcher.cc
diff --git a/components/translate/core/browser/translate_url_fetcher.cc b/components/translate/core/browser/translate_url_fetcher.cc
index a02936941b0d892b05e07e849d96ce080d25720d..85988a9125e93559975b5fcf8d7bfbbb771e6daf 100644
--- a/components/translate/core/browser/translate_url_fetcher.cc
+++ b/components/translate/core/browser/translate_url_fetcher.cc
@@ -4,7 +4,7 @@
 
 #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"
@@ -17,11 +17,9 @@ 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() {
@@ -52,7 +50,8 @@ bool TranslateURLFetcher::Request(
       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.