components: arc: Fix DCHECK at GpuArcVideoDecodeAccelerator

This CL fixes a wrong DCHECK for checking if a Optional has value
before dereferencing it.

BUG=b:153608694
TEST=ninja chrome

Change-Id: I4b054df94555d828d5523a766484e7fbc64ced09
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2413680
Auto-Submit: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Chih-Yu Huang <akahuang@chromium.org>
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808144}

components/arc/video_accelerator/gpu_arc_video_decode_accelerator.cc

@@ -493,7 +493,7 @@ void GpuArcVideoDecodeAccelerator::ImportBufferForPicture(
 
   gfx::GpuMemoryBufferHandle gmb_handle;
   gmb_handle.type = gfx::NATIVE_PIXMAP;
-  DCHECK(!secure_mode_.has_value());
+  DCHECK(secure_mode_.has_value());
   if (*secure_mode_) {
     // Get protected output buffer associated with |handle_fd|.
     // Duplicating handle here is needed as ownership of passed fd is