Fix warnings and remove dead code

Change-Id: I574d823fedf4b752c3df5a72599b390f708823ac
diff --git a/src/com/android/launcher2/SearchDropTargetBar.java b/src/com/android/launcher2/SearchDropTargetBar.java
index 76d7076..30978a8 100644
--- a/src/com/android/launcher2/SearchDropTargetBar.java
+++ b/src/com/android/launcher2/SearchDropTargetBar.java
@@ -246,7 +246,7 @@
                 mQSBSearchBar.setBackgroundResource(0);
             } else if (mPreviousBackground != null && (searchVisible || voiceVisible)) {
                 // Restore the background
-                mQSBSearchBar.setBackgroundDrawable(mPreviousBackground);
+                mQSBSearchBar.setBackground(mPreviousBackground);
             }
         }
     }