Allow the old launcher content URI to be overrided

Move the URI used to import favorites from launcher2 to be loaded
from a string resource.  This allows it to be overridden.

This will enable permissions fix for GoogleSearch.

Bug: 12058200
Change-Id: I31243fe89f545c9771d5cceffe1c9e7668a42bc5
diff --git a/src/com/android/launcher3/LauncherModel.java b/src/com/android/launcher3/LauncherModel.java
index 145d225..937f02b 100644
--- a/src/com/android/launcher3/LauncherModel.java
+++ b/src/com/android/launcher3/LauncherModel.java
@@ -193,7 +193,7 @@
 
         mAppsCanBeOnRemoveableStorage = Environment.isExternalStorageRemovable();
         ContentProviderClient client = contentResolver.acquireContentProviderClient(
-                LauncherSettings.Favorites.OLD_CONTENT_URI);
+                Uri.parse(context.getString(R.string.old_launcher_provider_uri)));
         mOldContentProviderExists = (client != null);
         if (client != null) {
             client.release();