MD Settings: Use a browser proxy from the languages page. Re-enable test.

chrome/browser/resources/settings/languages_page/languages_types.js

Index: chrome/browser/resources/settings/languages_page/languages_types.js
diff --git a/chrome/browser/resources/settings/languages_page/languages_types.js b/chrome/browser/resources/settings/languages_page/languages_types.js
index 36d446f5fecbe98667a80466fb077bb47c6013d4..2e0b916544d3582f0450f16d55e983892eccb1ba 100644
--- a/chrome/browser/resources/settings/languages_page/languages_types.js
+++ b/chrome/browser/resources/settings/languages_page/languages_types.js
@@ -66,13 +66,6 @@ LanguageHelper.prototype = {
 
 // <if expr="chromeos or is_win">
   /**
-   * Sets the prospective UI language to the chosen language. This won't affect
-   * the actual UI language until a restart.
-   * @param {string} languageCode
-   */
-  setProspectiveUILanguage: assertNotReached,
-
-  /**
    * True if the prospective UI language has been changed.
    * @return {boolean}
    */
@@ -168,9 +161,6 @@ LanguageHelper.prototype = {
   /** @param {string} id */
   removeInputMethod: assertNotReached,
 
-  /** @param {string} id */
-  setCurrentInputMethod: assertNotReached,
-
   /**
    * @param {string} languageCode
    * @return {!Array<!chrome.languageSettingsPrivate.InputMethod>}
@@ -182,8 +172,5 @@ LanguageHelper.prototype = {
    * @return {boolean}
    */
   isComponentIme: assertNotReached,
-
-  /** @param {string} id Input method ID. */
-  openInputMethodOptions: assertNotReached,
 // </if>
 };