GPU watchdog: Restore NoBarrier_Load for reading the arm/disarm counter

Release_Load() was used for an experiment. Now it's not needed. Change
it back to Nobarrier_Load().

Bug:949839

Change-Id: I32faf515046b52a46165c741b80fd5bed1aea13c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144681
Commit-Queue: Maggie Chen <magchen@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758043}

gpu/ipc/service/gpu_watchdog_thread_v2.cc

@@ -405,11 +405,11 @@ void GpuWatchdogThreadImplV2::InProgress() {
 
 bool GpuWatchdogThreadImplV2::IsArmed() {
   // It's an odd number.
-  return base::subtle::Release_Load(&arm_disarm_counter_) & 1;
+  return base::subtle::NoBarrier_Load(&arm_disarm_counter_) & 1;
 }
 
 base::subtle::Atomic32 GpuWatchdogThreadImplV2::ReadArmDisarmCounter() {
-  return base::subtle::Release_Load(&arm_disarm_counter_);
+  return base::subtle::NoBarrier_Load(&arm_disarm_counter_);
 }
 
 // Running on the watchdog thread.