Set application language always blocked.

In some corner case, the application language isn't blocked due to its
legacy state, so we set app language blocked always.

Bug: 783049
Change-Id: I13924b12bf2353217db902bc48796ea74cfafd7f
Reviewed-on: https://chromium-review.googlesource.com/890147Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Leo Zhang <googleo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532693}

chrome/browser/android/preferences/pref_service_bridge.cc

@@ -1252,6 +1252,12 @@ static jboolean JNI_PrefServiceBridge_IsBlockedLanguage(
   std::string language_code(ConvertJavaStringToUTF8(env, language));
   translate::ToTranslateLanguageSynonym(&language_code);
 
+  // Application language is always blocked.
+  std::string app_locale = g_browser_process->GetApplicationLocale();
+  translate::ToTranslateLanguageSynonym(&app_locale);
+  if (app_locale == language_code)
+    return true;
+
   return translate_prefs->IsBlockedLanguage(language_code);
 }