Fix ifdef guards for base::SysInfo::KernelVersion

Use the same guards that base::SysInfo::KernelVersion is guarded by

Change-Id: I6ceb7a8ed371d5e9a1d661c340ab57ff7612054a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441280
Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813324}

media/gpu/test/video_frame_validator.cc

@@ -236,7 +236,7 @@ std::unique_ptr<VideoFrameValidator::MismatchedFrameInfo>
 MD5VideoFrameValidator::Validate(scoped_refptr<const VideoFrame> frame,
                                  size_t frame_index) {
   DCHECK_CALLED_ON_VALID_SEQUENCE(validator_thread_sequence_checker_);
-#if BUILDFLAG(USE_VAAPI)
+#if defined(OS_CHROMEOS) || BUILDFLAG(IS_LACROS)
   // b/149808895: There is a bug in the synchronization on mapped buffers, which
   // causes the frame validation failure. The bug is due to some missing i915
   // patches in kernel v3.18. The bug will be fixed if the kernel is upreved to
@@ -256,7 +256,7 @@ MD5VideoFrameValidator::Validate(scoped_refptr<const VideoFrame> frame,
     if (is_skylake)
       usleep(10);
   }
-#endif  // BUILDFLAG(USE_VAAPI)
+#endif  // defined(OS_CHROMEOS) || BUILDFLAG(IS_LACROS)
   if (frame->format() != validation_format_) {
     frame = ConvertVideoFrame(frame.get(), validation_format_);
   }