Bug 1068596 - pass SHARE_DELETE when opening a file so the file can be deleted without waiting for GC. r=roc.

dom/media/MediaResource.cpp

@@ -16,6 +16,7 @@
 #include "nsThreadUtils.h"
 #include "nsIFile.h"
 #include "nsIFileChannel.h"
+#include "nsIFileStreams.h"
 #include "nsIHttpChannel.h"
 #include "nsISeekableStream.h"
 #include "nsIInputStream.h"
@@ -1367,7 +1368,8 @@ nsresult FileMediaResource::Open(nsIStreamListener** aStreamListener)
       rv = fc->GetFile(getter_AddRefs(file));
       NS_ENSURE_SUCCESS(rv, rv);
 
-      rv = NS_NewLocalFileInputStream(getter_AddRefs(mInput), file);
+      rv = NS_NewLocalFileInputStream(
+        getter_AddRefs(mInput), file, -1, -1, nsIFileInputStream::SHARE_DELETE);
     } else if (IsBlobURI(mURI)) {
       rv = NS_GetStreamForBlobURI(mURI, getter_AddRefs(mInput));
     }