VP8Decoder: Drop references to reference frames earlier.

content/common/gpu/media/vp8_decoder.cc

Index: content/common/gpu/media/vp8_decoder.cc
diff --git a/content/common/gpu/media/vp8_decoder.cc b/content/common/gpu/media/vp8_decoder.cc
index fc3793c752719199f5ac19e5230d56c0ae9cdbe6..a2fe85c19b5237484698812793344b28d9e5aa6e 100644
--- a/content/common/gpu/media/vp8_decoder.cc
+++ b/content/common/gpu/media/vp8_decoder.cc
@@ -75,6 +75,12 @@ VP8Decoder::DecodeResult VP8Decoder::Decode() {
     if (new_pic_size != pic_size_) {
       DVLOG(2) << "New resolution: " << new_pic_size.ToString();
       pic_size_ = new_pic_size;
+
+      DCHECK(!curr_pic_);
+      last_frame_ = nullptr;
+      golden_frame_ = nullptr;
+      alt_frame_ = nullptr;
+
       return kAllocateNewSurfaces;
     }