media/gpu/v4l2: fix error log priority

A request timing out indicates a serious issue ; this should be logged
at level 1, not 3.

BUG=None
TEST=VDtest builds and runs.

Change-Id: I5742a0f8e8de93852e30ae049b54148f16ac7d95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2041710
Auto-Submit: Alexandre Courbot <acourbot@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739234}

media/gpu/v4l2/v4l2_video_decoder_backend_stateless.cc

@@ -264,7 +264,7 @@ V4L2StatelessVideoDecoderBackend::CreateSurface() {
     base::Optional<V4L2RequestRef> request_ref =
         requests_queue_->GetFreeRequest();
     if (!request_ref) {
-      DVLOGF(3) << "Could not get free request.";
+      DVLOGF(1) << "Could not get free request.";
       return nullptr;
     }