Using content provider to update launcher settings

> Removing cross process preference file
> Removed broadcast listener management for settings changes
> Defining content provider method to get/set laucnehr preferences

Change-Id: Ida36eac0ab17c1d48fedc9404817a53a89b36c4f
diff --git a/src/com/android/launcher3/LauncherFiles.java b/src/com/android/launcher3/LauncherFiles.java
index ec4e4f9..c08cd0b 100644
--- a/src/com/android/launcher3/LauncherFiles.java
+++ b/src/com/android/launcher3/LauncherFiles.java
@@ -26,8 +26,6 @@
     public static final String WIDGET_PREVIEWS_DB = "widgetpreviews.db";
     public static final String APP_ICONS_DB = "app_icons.db";
 
-    public static final String ROTATION_PREF_FILE = "com.android.launcher3.rotation.prefs";
-
     public static final List<String> ALL_FILES = Collections.unmodifiableList(Arrays.asList(
             DEFAULT_WALLPAPER_THUMBNAIL,
             DEFAULT_WALLPAPER_THUMBNAIL_OLD,
@@ -37,8 +35,7 @@
             WALLPAPER_IMAGES_DB,
             WIDGET_PREVIEWS_DB,
             MANAGED_USER_PREFERENCES_KEY,
-            APP_ICONS_DB,
-            ROTATION_PREF_FILE));
+            APP_ICONS_DB));
 
     // TODO: Delete these files on upgrade
     public static final List<String> OBSOLETE_FILES = Collections.unmodifiableList(Arrays.asList(