some clean up of video size change notification

need to consider rotation when notifying video size change after
initial prepare, in addition to after an output format change.

Bug: 16870964
Change-Id: Icd1c9e901ac932e720ce95b8a983c0edcf251c35
diff --git a/media/libmediaplayerservice/nuplayer/GenericSource.cpp b/media/libmediaplayerservice/nuplayer/GenericSource.cpp
index 1616448..6676461 100644
--- a/media/libmediaplayerservice/nuplayer/GenericSource.cpp
+++ b/media/libmediaplayerservice/nuplayer/GenericSource.cpp
@@ -228,13 +228,7 @@
     }
 
     if (mVideoTrack.mSource != NULL) {
-        sp<MetaData> meta = mVideoTrack.mSource->getFormat();
-
-        int32_t width, height;
-        CHECK(meta->findInt32(kKeyWidth, &width));
-        CHECK(meta->findInt32(kKeyHeight, &height));
-
-        notifyVideoSizeChanged(width, height);
+        notifyVideoSizeChanged(getFormat(false /* audio */));
     }
 
     notifyFlagsChanged(