Fix mime type mappings when the unified media pipeline is enabled.

media/base/media.h

Index: media/base/media.h
diff --git a/media/base/media.h b/media/base/media.h
index 01a913bc45ff956702377f097a036015951821f0..22c0034fc21b1ba8fb6de93d5a12cee70ab73a23 100644
--- a/media/base/media.h
+++ b/media/base/media.h
@@ -8,6 +8,7 @@
 #ifndef MEDIA_BASE_MEDIA_H_
 #define MEDIA_BASE_MEDIA_H_
 
+#include "build/build_config.h"
 #include "media/base/media_export.h"
 
 namespace base {
@@ -20,6 +21,10 @@ namespace media {
 // features.
 MEDIA_EXPORT void InitializeMediaLibrary();
 
+#if defined(OS_ANDROID)
+MEDIA_EXPORT bool IsUnifiedMediaPipelineEnabled();
+#endif
+
 }  // namespace media
 
 #endif  // MEDIA_BASE_MEDIA_H_