Removing Launcher dependency from Folders

This allows opening/closing folders without a Launcher context

Bug: 187353581
Test: Manual
Change-Id: Id73a40445a23004eb554f0422d286aa0ff6b3c41

src/com/android/launcher3/BaseActivity.java

@@ -132,6 +132,7 @@ public abstract class BaseActivity extends Activity implements ActivityContext {
 
     private final ViewCache mViewCache = new ViewCache();
 
+    @Override
     public ViewCache getViewCache() {
         return mViewCache;
     }