VideoGridFragment: don't overuse context

Just to send a broadcast, use the VLCApplication context

vlc-android/src/org/videolan/vlc/MediaLibrary.java

@@ -81,7 +81,7 @@ public class MediaLibrary {
     public void loadMediaItems(Context context) {
         if (mLoadingThread == null || mLoadingThread.getState() == State.TERMINATED) {
             isStopping = false;
-            VideoGridFragment.actionScanStart(context.getApplicationContext());
+            VideoGridFragment.actionScanStart();
             mLoadingThread = new Thread(new GetMediaItemsRunnable(context.getApplicationContext()));
             mLoadingThread.start();
         }

vlc-android/src/org/videolan/vlc/gui/video/VideoGridFragment.java

@@ -35,6 +35,7 @@ import org.videolan.vlc.MediaLibrary;
 import org.videolan.vlc.R;
 import org.videolan.vlc.Thumbnailer;
 import org.videolan.vlc.Util;
+import org.videolan.vlc.VLCApplication;
 import org.videolan.vlc.VlcRunnable;
 import org.videolan.vlc.WeakHandler;
 import org.videolan.vlc.gui.CommonDialogs;
@@ -153,7 +154,7 @@ public class VideoGridFragment extends SherlockGridFragment implements ISortable
         getActivity().registerReceiver(messageReceiverVideoListFragment, filter);
         Log.i(TAG,"mMediaLibrary.isWorking() " + Boolean.toString(mMediaLibrary.isWorking()));
         if (mMediaLibrary.isWorking()) {
-            actionScanStart(getActivity().getApplicationContext());
+            actionScanStart();
         }
 
         mAnimator = new VideoGridAnimator(getGridView());
@@ -479,19 +480,15 @@ public class VideoGridFragment extends SherlockGridFragment implements ISortable
         }
     };
 
-    public static void actionScanStart(Context context) {
-        if (context == null)
-            return;
+    public static void actionScanStart() {
         Intent intent = new Intent();
         intent.setAction(ACTION_SCAN_START);
-        context.getApplicationContext().sendBroadcast(intent);
+        VLCApplication.getAppContext().sendBroadcast(intent);
     }
 
-    public static void actionScanStop(Context context) {
-        if (context == null)
-            return;
+    public static void actionScanStop() {
         Intent intent = new Intent();
         intent.setAction(ACTION_SCAN_STOP);
-        context.getApplicationContext().sendBroadcast(intent);
+        VLCApplication.getAppContext().sendBroadcast(intent);
     }
 }