Re-enable NonBlockingEventBrowserTest on Win8 TSan Build.

content/browser/renderer_host/input/non_blocking_event_browsertest.cc

Index: content/browser/renderer_host/input/non_blocking_event_browsertest.cc
diff --git a/content/browser/renderer_host/input/non_blocking_event_browsertest.cc b/content/browser/renderer_host/input/non_blocking_event_browsertest.cc
index 96f109282d68491afc80e16b641329e04bd1c3b8..b5fbe71cd9d2e698da1b8af84f2e72372b72c473 100644
--- a/content/browser/renderer_host/input/non_blocking_event_browsertest.cc
+++ b/content/browser/renderer_host/input/non_blocking_event_browsertest.cc
@@ -167,13 +167,7 @@ class NonBlockingEventBrowserTest : public ContentBrowserTest {
   DISALLOW_COPY_AND_ASSIGN(NonBlockingEventBrowserTest);
 };
 
-// Also appears to be flaky under TSan. crbug.com/588199
-#if defined(THREAD_SANITIZER)
-#define MAYBE_MouseWheel DISABLED_MouseWheel
-#else
-#define MAYBE_MouseWheel MouseWheel
-#endif
-IN_PROC_BROWSER_TEST_F(NonBlockingEventBrowserTest, MAYBE_MouseWheel) {
+IN_PROC_BROWSER_TEST_F(NonBlockingEventBrowserTest, MouseWheel) {
   LoadURL();
   DoWheelScroll();
 }