Bug 1497842 - Remove INSTALL_LOCALE from APP_CONSTANTS r=Standard8

Differential Revision: https://phabricator.services.mozilla.com/D24662

--HG--
extra : moz-landing-system : lando

toolkit/modules/AppConstants.jsm

@@ -312,7 +312,6 @@ this.AppConstants = Object.freeze({
   MOZ_BUILD_APP: "@MOZ_BUILD_APP@",
   MOZ_MACBUNDLE_NAME: "@MOZ_MACBUNDLE_NAME@",
   MOZ_UPDATE_CHANNEL: "@MOZ_UPDATE_CHANNEL@",
-  INSTALL_LOCALE: "@AB_CD@",
   MOZ_WIDGET_TOOLKIT: "@MOZ_WIDGET_TOOLKIT@",
   ANDROID_PACKAGE_NAME: "@ANDROID_PACKAGE_NAME@",
 

toolkit/modules/tests/xpcshell/test_UpdateUtils_url.js

@@ -224,8 +224,8 @@ add_task(async function test_locale() {
   do_get_profile();
 
   let url = URL_PREFIX + "%LOCALE%/";
-  Assert.equal(await getResult(url), AppConstants.INSTALL_LOCALE,
-               "the url param for %LOCALE%" + MSG_SHOULD_EQUAL);
+  Assert.equal(await getResult(url), "en-US",
+               "Assuming we are built with en-US, the url param for %LOCALE%" + MSG_SHOULD_EQUAL);
 });
 
 // url constructed with %CHANNEL%