Revert "Disable GpuInitializationAndRunningTasks on TSan"

This reverts commit 007cb99b.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Disable GpuInitializationAndRunningTasks on TSan
> 
> It was flaky on TSan bot.
> 
> TBR=zmo@chromium.org
> 
> No-Try: true
> Bug: 1030130
> Change-Id: I3dbbe2f8e3559609bc1bac8e6504417c2a2c1b11
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1947866
> Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
> Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#720815}

TBR=zmo@chromium.org,shimazu@chromium.org

Change-Id: Ie4472f6d98e0fe98ce95af1c7be7e95ef568b436
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1030130
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1948516Reviewed-by: Maggie Chen <magchen@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720987}

gpu/ipc/service/gpu_watchdog_thread_unittest.cc

@@ -159,15 +159,7 @@ TEST_F(GpuWatchdogTest, GpuInitializationHang) {
 }
 
 // Normal GPU Initialization and Running Task
-//
-// Disabled on TSan due to flakiness: https://crbug.com/1030130.
-#if defined(THREAD_SANITIZER)
-#define MAYBE_GpuInitializationAndRunningTasks \
-  DISABLED_GpuInitializationAndRunningTasks
-#else
-#define MAYBE_GpuInitializationAndRunningTasks GpuInitializationAndRunningTasks
-#endif
-TEST_F(GpuWatchdogTest, MAYBE_GpuInitializationAndRunningTasks) {
+TEST_F(GpuWatchdogTest, GpuInitializationAndRunningTasks) {
   // Assume GPU initialization takes 300 milliseconds.
   SimpleTask(base::TimeDelta::FromMilliseconds(300));
   watchdog_thread_->OnInitComplete();