Clean up unused code and import declarations

Change-Id: If36fd2d99a51b07290b13f697b3ea08d31feb023

src/com/android/launcher2/FocusHelper.java

@@ -23,7 +23,6 @@ import android.view.ViewGroup;
 import android.view.ViewParent;
 import android.widget.TabHost;
 import android.widget.TabWidget;
-import android.widget.TextView;
 
 import com.android.launcher.R;
 
@@ -117,13 +116,6 @@ public class FocusHelper {
         return wasHandled;
     }
 
-    /**
-     * Private helper to determine whether a view is visible.
-     */
-    private static boolean isVisible(View v) {
-        return v.getVisibility() == View.VISIBLE;
-    }
-
     /**
      * Returns the Viewgroup containing page contents for the page at the index specified.
      */