stagefright: warnings be gone, some are now errors, use clang

Change-Id: I81f438ae444f04c12ae27ae4ef6d073033de172c
diff --git a/media/libmediaplayerservice/nuplayer/GenericSource.h b/media/libmediaplayerservice/nuplayer/GenericSource.h
index 2f6e78e..7fab051 100644
--- a/media/libmediaplayerservice/nuplayer/GenericSource.h
+++ b/media/libmediaplayerservice/nuplayer/GenericSource.h
@@ -31,13 +31,13 @@
 class DrmManagerClient;
 struct AnotherPacketSource;
 struct ARTSPController;
-struct DataSource;
-struct IDataSource;
+class DataSource;
+class IDataSource;
 struct IMediaHTTPService;
 struct MediaSource;
 class MediaBuffer;
 struct NuCachedSource2;
-struct WVMExtractor;
+class WVMExtractor;
 
 struct NuPlayer::GenericSource : public NuPlayer::Source {
     GenericSource(const sp<AMessage> &notify, bool uidValid, uid_t uid);
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayer.h b/media/libmediaplayerservice/nuplayer/NuPlayer.h
index c0205b6..14bdb01 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayer.h
+++ b/media/libmediaplayerservice/nuplayer/NuPlayer.h
@@ -26,7 +26,7 @@
 
 struct ABuffer;
 struct AMessage;
-struct IDataSource;
+class IDataSource;
 class MetaData;
 struct NuPlayerDriver;
 
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayerDecoderBase.h b/media/libmediaplayerservice/nuplayer/NuPlayerDecoderBase.h
index 97e9269..331a2a8 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayerDecoderBase.h
+++ b/media/libmediaplayerservice/nuplayer/NuPlayerDecoderBase.h
@@ -26,7 +26,7 @@
 
 struct ABuffer;
 struct MediaCodec;
-struct MediaBuffer;
+class MediaBuffer;
 
 struct NuPlayer::DecoderBase : public AHandler {
     DecoderBase(const sp<AMessage> &notify);
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayerSource.h b/media/libmediaplayerservice/nuplayer/NuPlayerSource.h
index 1b0c2df..ef1ba13 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayerSource.h
+++ b/media/libmediaplayerservice/nuplayer/NuPlayerSource.h
@@ -28,7 +28,7 @@
 namespace android {
 
 struct ABuffer;
-struct MediaBuffer;
+class MediaBuffer;
 
 struct NuPlayer::Source : public AHandler {
     enum Flags {