libmedia: remove skia include

skia is not used in this file, remove the unnecessary include.

Change-Id: Ib4d0e0c0090c6b37ff8cfb816c0d8ba82a9638a4
diff --git a/media/libmedia/IMediaMetadataRetriever.cpp b/media/libmedia/IMediaMetadataRetriever.cpp
index 9b8d7c3..7e6d54b 100644
--- a/media/libmedia/IMediaMetadataRetriever.cpp
+++ b/media/libmedia/IMediaMetadataRetriever.cpp
@@ -18,7 +18,6 @@
 #include <stdint.h>
 #include <sys/types.h>
 #include <binder/Parcel.h>
-#include <SkBitmap.h>
 #include <media/IMediaMetadataRetriever.h>
 #include <utils/String8.h>