Removed makeInvisible() function

This is now being done inside stopUI instead of its own separate
call since it needs to be done on the UI thread inside FaceLockService.

Change-Id: Iaf3a203f7f201ba4dde4c878f457e765f11e6c0e

Author: Danielle Millett

core/java/com/android/internal/policy/IFaceLockInterface.aidl

@@ -23,7 +23,6 @@ interface IFaceLockInterface {
     void startUi(IBinder containingWindowToken, int x, int y, int width, int height,
             boolean useLiveliness);
     void stopUi();
-    void makeInvisible();
     void registerCallback(IFaceLockCallback cb);
     void unregisterCallback(IFaceLockCallback cb);
 }

policy/src/com/android/internal/policy/impl/keyguard/FaceUnlock.java

@@ -151,13 +151,6 @@ public boolean stop() {
         }
 
         boolean mWasRunning = mIsRunning;
-        try {
-            if (mService != null) {
-                mService.makeInvisible();
-            }
-        } catch (RemoteException e) {
-            Log.e(TAG, "Caught exception making Face Unlock invisible: " + e.toString());
-        }
 
         stopUi();