Revert "sheriff: Disable BrowserNonClientFrameViewPopupTest.HitTestPopupTopChrome."

This reverts commit e9e520a3.

Reason for revert: Flakiness unlikely to be caused by the test itself.

Original change's description:
> sheriff: Disable BrowserNonClientFrameViewPopupTest.HitTestPopupTopChrome.
> 
> Flaky on Linux ASAN and TSAN.
> 
> TBR=bsep
> 
> Bug: 998946
> Change-Id: Iead970e3ca6738c495a9b922c19f24294b9093e4
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1774006
> Reviewed-by: Darren Shen <shend@chromium.org>
> Commit-Queue: Darren Shen <shend@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#691478}

TBR=shend@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 998946
Change-Id: Id164a193c1182b71d002b66b4e8b328fddde7402
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1835619Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702017}

chrome/browser/ui/views/frame/browser_non_client_frame_view_unittest.cc

@@ -51,14 +51,7 @@ class BrowserNonClientFrameViewPopupTest
       : BrowserNonClientFrameViewTest(Browser::TYPE_POPUP) {}
 };
 
-// TODO(crbug.com/998369): Flaky on Linux TSAN and ASAN.
-#if defined(OS_LINUX) && \
-    (defined(ADDRESS_SANITIZER) || defined(THREAD_SANITIZER))
-#define MAYBE_HitTestPopupTopChrome DISABLED_HitTestPopupTopChrome
-#else
-#define MAYBE_HitTestPopupTopChrome HitTestPopupTopChrome
-#endif
-TEST_F(BrowserNonClientFrameViewPopupTest, MAYBE_HitTestPopupTopChrome) {
+TEST_F(BrowserNonClientFrameViewPopupTest, HitTestPopupTopChrome) {
   EXPECT_FALSE(frame_view_->HitTestRect(gfx::Rect(-1, 4, 1, 1)));
   EXPECT_FALSE(frame_view_->HitTestRect(gfx::Rect(4, -1, 1, 1)));
   const int top_inset = frame_view_->GetTopInset(false);