Disable a flaky DumpAccessibilityTreeTest on Android.

DumpAccessibilityTreeTest.AccessibilityAriaMenuItemInGroup is failing.

Bug: 1116627
Change-Id: I05ed4eba63137de5654a1652d45c5248df95fece
Tbr: aleventhal@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357463Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798377}

content/browser/accessibility/dump_accessibility_tree_browsertest.cc

@@ -852,8 +852,14 @@ IN_PROC_BROWSER_TEST_P(DumpAccessibilityTreeTest, AccessibilityAriaMenuItem) {
   RunAriaTest(FILE_PATH_LITERAL("aria-menuitem.html"));
 }
 
+#if defined(OS_ANDROID)
+#define MAYBE_AccessibilityAriaMenuItemInGroup \
+  DISABLED_AccessibilityAriaMenuItemInGroup
+#else
+#define MAYBE_AccessibilityAriaMenuItemInGroup AccessibilityAriaMenuItemInGroup
+#endif
 IN_PROC_BROWSER_TEST_P(DumpAccessibilityTreeTest,
-                       AccessibilityAriaMenuItemInGroup) {
+                       MAYBE_AccessibilityAriaMenuItemInGroup) {
   RunAriaTest(FILE_PATH_LITERAL("aria-menuitem-in-group.html"));
 }
 // crbug.com/442278 will stop creating new text elements representing title.