Move TranslateManager unit tests out of the browser_tests target.

components/translate/core/browser/translate_download_manager.cc

Index: components/translate/core/browser/translate_download_manager.cc
diff --git a/components/translate/core/browser/translate_download_manager.cc b/components/translate/core/browser/translate_download_manager.cc
index 63e85a0754af2f3c30198b4610a04ee01350bc15..6b33ec032024d22fa7961f90b2814e33be19f302 100644
--- a/components/translate/core/browser/translate_download_manager.cc
+++ b/components/translate/core/browser/translate_download_manager.cc
@@ -118,6 +118,11 @@ void TranslateDownloadManager::ClearTranslateScriptForTesting() {
   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();