Dump local source, not remote

dumpsys media.extractor was printing the remote source instead of starting at
the local source.

Bug: 22775369
Change-Id: I5026218515bf7ceb8485005ed7d89638a9c1963b
diff --git a/media/libmedia/IMediaExtractor.cpp b/media/libmedia/IMediaExtractor.cpp
index f142ccc..e8ad75b 100644
--- a/media/libmedia/IMediaExtractor.cpp
+++ b/media/libmedia/IMediaExtractor.cpp
@@ -239,7 +239,7 @@
 
 void registerMediaExtractor(
         const sp<IMediaExtractor> &extractor,
-        const sp<IDataSource> &source,
+        const sp<DataSource> &source,
         const char *mime) {
     ExtractorInstance ex;
     ex.mime = mime == NULL ? "NULL" : mime;