Add histogram entry for GpuVideoDecoder errors.

content/renderer/media/rtc_video_decoder.cc

Index: content/renderer/media/rtc_video_decoder.cc
diff --git a/content/renderer/media/rtc_video_decoder.cc b/content/renderer/media/rtc_video_decoder.cc
index 49f64362aa3622623d8b1c55688ebbe5cd6f7c63..0bfeb32a4a71b88baccbdff29b2e9407d1bbddbd 100644
--- a/content/renderer/media/rtc_video_decoder.cc
+++ b/content/renderer/media/rtc_video_decoder.cc
@@ -469,9 +469,8 @@ void RTCVideoDecoder::NotifyError(media::VideoDecodeAccelerator::Error error) {
     return;
 
   LOG(ERROR) << "VDA Error:" << error;
-  UMA_HISTOGRAM_ENUMERATION("Media.RTCVideoDecoderError",
-                            error,
-                            media::VideoDecodeAccelerator::LARGEST_ERROR_ENUM);
+  UMA_HISTOGRAM_ENUMERATION("Media.RTCVideoDecoderError", error,
+                            media::VideoDecodeAccelerator::ERROR_MAX + 1);
   DestroyVDA();
 
   base::AutoLock auto_lock(lock_);