VDA: Append correct number of bytes per frame for VP8

content/common/gpu/media/video_decode_accelerator_unittest.cc

Index: content/common/gpu/media/video_decode_accelerator_unittest.cc
diff --git a/content/common/gpu/media/video_decode_accelerator_unittest.cc b/content/common/gpu/media/video_decode_accelerator_unittest.cc
index 3eee8f78198055d55eae972bdd1fd58359cd5197..3ae6b474b7dec68412f25b7c0b7a95ec32b098f8 100644
--- a/content/common/gpu/media/video_decode_accelerator_unittest.cc
+++ b/content/common/gpu/media/video_decode_accelerator_unittest.cc
@@ -535,7 +535,7 @@ std::string GLRenderingVDAClient::GetBytesForNextFrames(
   for (int i = 0; i < num_fragments_per_decode_; ++i) {
     uint32 frame_size = *reinterpret_cast<uint32*>(&encoded_data_[*end_pos]);
     *end_pos += 12;  // Skip frame header.
-    bytes.append(encoded_data_.substr(*end_pos, *end_pos + frame_size));
+    bytes.append(encoded_data_.substr(*end_pos, frame_size));
     *end_pos += frame_size;
     if (*end_pos + 12 >= encoded_data_.size())
       return bytes;