Disable AccessibilityElementsCaretBrowsingEnabled test on TSAN

The test seems to be flaky on this bot.

TBR=aboxhall@chromium.org

Bug: 1066702
Change-Id: I445f46df05c70f86c0433322a5cfbebaad853dfb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2130892
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Reviewed-by: Hiroshige Hayashizaki <hiroshige@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755252}

content/browser/accessibility/dump_accessibility_events_browsertest.cc

@@ -481,8 +481,16 @@ IN_PROC_BROWSER_TEST_P(DumpAccessibilityEventsTest,
   RunEventTest(FILE_PATH_LITERAL("checkbox-validity.html"));
 }
 
+// Flaky on TSAN, see https://crbug.com/1066702
+#if defined(THREAD_SANITIZER)
+#define MAYBE_AccessibilityEventsCaretBrowsingEnabled \
+  DISABLED_AccessibilityEventsCaretBrowsingEnabled
+#else
+#define MAYBE_AccessibilityEventsCaretBrowsingEnabled \
+  AccessibilityEventsCaretBrowsingEnabled
+#endif
 IN_PROC_BROWSER_TEST_P(DumpAccessibilityEventsTest,
-                       AccessibilityEventsCaretBrowsingEnabled) {
+                       MAYBE_AccessibilityEventsCaretBrowsingEnabled) {
   // Add command line switch that forces caret browsing on.
   base::CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kEnableCaretBrowsing);