Remove unnecessary parameter

Just get the parameter on server side

Change-Id: I433a63104dbb257e0d862be2ab61847cb36d1c15
diff --git a/media/libmedia/mediametadataretriever.cpp b/media/libmedia/mediametadataretriever.cpp
index b0241aa..110b94c 100644
--- a/media/libmedia/mediametadataretriever.cpp
+++ b/media/libmedia/mediametadataretriever.cpp
@@ -64,7 +64,7 @@
         ALOGE("failed to obtain MediaMetadataRetrieverService");
         return;
     }
-    sp<IMediaMetadataRetriever> retriever(service->createMetadataRetriever(getpid()));
+    sp<IMediaMetadataRetriever> retriever(service->createMetadataRetriever());
     if (retriever == 0) {
         ALOGE("failed to create IMediaMetadataRetriever object from server");
     }