Moving LauncherExtension to a separate package

Change-Id: I6eef1cbb17295e59eae04f90fa44037be5f7da4b
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 873ca32..1fb8e8d 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -93,8 +93,10 @@
             </intent-filter>
         </activity>
 
+        <!-- ENABLE_FOR_TESTING
+
         <activity
-            android:name="com.android.launcher3.LauncherExtension"
+            android:name="com.android.launcher3.testing.LauncherExtension"
             android:launchMode="singleTask"
             android:clearTaskOnLaunch="true"
             android:stateNotNeeded="true"
@@ -110,6 +112,8 @@
             </intent-filter>
         </activity>
 
+        -->
+
         <activity
             android:name="com.android.launcher3.ToggleWeightWatcher"
             android:label="@string/toggle_weight_watcher"