Remove unused variable.

Remove an unused variable from FallbackActivityControllerHelper.

Test: Build NexusLauncher, l3GoIconRecents
Change-Id: I77b5ae40b9e6aee47f23e6c3b4f718e744987200
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/FallbackActivityControllerHelper.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/FallbackActivityControllerHelper.java
index a84d230..1ed1353 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/FallbackActivityControllerHelper.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/FallbackActivityControllerHelper.java
@@ -50,11 +50,7 @@
 public final class FallbackActivityControllerHelper implements
         ActivityControlHelper<RecentsActivity> {
 
-    private final ComponentName mHomeComponent;
-
-    public FallbackActivityControllerHelper(ComponentName homeComponent) {
-        mHomeComponent = homeComponent;
-    }
+    public FallbackActivityControllerHelper() { }
 
     @Override
     public void onTransitionCancelled(RecentsActivity activity, boolean activityVisible) {
diff --git a/quickstep/src/com/android/quickstep/OverviewComponentObserver.java b/quickstep/src/com/android/quickstep/OverviewComponentObserver.java
index b6741f4..724a492 100644
--- a/quickstep/src/com/android/quickstep/OverviewComponentObserver.java
+++ b/quickstep/src/com/android/quickstep/OverviewComponentObserver.java
@@ -96,7 +96,7 @@
         } else {
             // The default home app is a different launcher. Use the fallback Overview instead.
             overviewComponent = new ComponentName(mContext, RecentsActivity.class);
-            mActivityControlHelper = new FallbackActivityControllerHelper(defaultHome);
+            mActivityControlHelper = new FallbackActivityControllerHelper();
             overviewIntentCategory = Intent.CATEGORY_DEFAULT;
 
             // User's default home app can change as a result of package updates of this app (such