Move TranslateManager unit tests out of the browser_tests target.

components/translate/core/browser/translate_download_manager.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_download_manager.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "base/prefs/pref_service.h"
@@ skipping 100 matching lines @@
 }
 
 void TranslateDownloadManager::ClearTranslateScriptForTesting() {
   if (script_.get() == NULL) {
     NOTREACHED();
     return;
   }
   script_->Clear();
 }
 
+void TranslateDownloadManager::ResetForTesting() {
+  language_list_.reset(new TranslateLanguageList);
+  script_.reset(new TranslateScript);
+}
+
 void TranslateDownloadManager::SetTranslateScriptExpirationDelay(int delay_ms) {
   if (script_.get() == NULL) {
     NOTREACHED();
     return;
   }
   script_->set_expiration_delay(delay_ms);
 }