Revert "Adding CHECK macro to debug crash."

This reverts commit bafb8331.

Reverting the patch since the CHECK macro is
no longer needed now.

Original change's description:
> Adding CHECK macro to debug crash.
>
> Moving a DCHCEK to CHECK and adding a new CHECK macro to debug crash
> which are hard to reproduce on local devices. This CHECK will soon
> be moved back to DCHECK.
>
> Bug: 892354
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
> Change-Id: I44e237db73cec5259b90bb312e7940b41553d332
> Reviewed-on: https://chromium-review.googlesource.com/c/1282104
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Commit-Queue: vikas soni <vikassoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#599885}

TBR=piman@chromium.org,vikassoni@chromium.org

Bug: 892354
Change-Id: Id75912831cb8087976b481feb51293d941263da1
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/c/1295314
Commit-Queue: vikas soni <vikassoni@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601835}

ui/gl/gpu_timing.cc

@@ -524,11 +524,7 @@ void GPUTimer::Reset() {
 }
 
 void GPUTimer::QueryTimeStamp() {
-  // TODO(vikassoni): Adding CHECK instead of DCHECK temporarily to debug
-  // a crash - http://crbug.com/892354. This is only meant for canary and will
-  // be removed in few days.
-  CHECK(gpu_timing_client_);
-  CHECK(gpu_timing_client_->gpu_timing_);
+  DCHECK(gpu_timing_client_->gpu_timing_);
   Reset();
   time_stamp_result_ = gpu_timing_client_->gpu_timing_->DoTimeStampQuery();
   timer_state_ = kTimerState_WaitingForResult;