Enforce Stop() is always called before dtor in FFmepgVideoDecoder.

media/filters/ffmpeg_video_decoder.cc

Index: media/filters/ffmpeg_video_decoder.cc
diff --git a/media/filters/ffmpeg_video_decoder.cc b/media/filters/ffmpeg_video_decoder.cc
index f05fa3f98e36b743b761173552a35f7a85c8defa..2b813658aedab7e5fba3bb9617eb26c54d2db502 100644
--- a/media/filters/ffmpeg_video_decoder.cc
+++ b/media/filters/ffmpeg_video_decoder.cc
@@ -207,6 +207,11 @@ void FFmpegVideoDecoder::Stop(const base::Closure& closure) {
     return;
   }
 
+  if (state_ == kUninitialized) {
+    closure.Run();
+    return;
+  }
+
   if (decryptor_)
     decryptor_->CancelDecrypt();
 
@@ -226,7 +231,7 @@ void FFmpegVideoDecoder::DoStop() {
 }
 
 FFmpegVideoDecoder::~FFmpegVideoDecoder() {
-  ReleaseFFmpegResources();
+  DCHECK_EQ(kUninitialized, state_);
 }
 
 void FFmpegVideoDecoder::DoRead(const ReadCB& read_cb) {