Remove some unused window manager methods.

Change-Id: Idd23ea4adb7328781ea81c45d61392b51dee1374
Signed-off-by: Mike Lockwood <lockwood@android.com>

policy/com/android/internal/policy/impl/PhoneWindowManager.java

@@ -1928,8 +1928,7 @@ public class PhoneWindowManager implements WindowManagerPolicy {
         mKeyguardMediator.verifyUnlock(callback);
     }
 
-    /** {@inheritDoc} */
-    public boolean keyguardIsShowingTq() {
+    private boolean keyguardIsShowingTq() {
         return mKeyguardMediator.isShowingAndNotHidden();
     }