Disable AccessibilityPrivateApiTest.OpenSettingsSubpage

Disabled due to flaky failures.

TBR=aleventhal

Bug: 1030507
Change-Id: I4d998a5b0175b07bcf31bbf385fc352b2d3d5521
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1949558Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721287}

chrome/browser/accessibility/accessibility_extension_api_browsertest.cc

@@ -29,7 +29,13 @@ IN_PROC_BROWSER_TEST_F(AccessibilityPrivateApiTest, GetDisplayLanguageTest) {
       << message_;
 }
 
-IN_PROC_BROWSER_TEST_F(AccessibilityPrivateApiTest, OpenSettingsSubpage) {
+// Flaky on a debug build, see crbug.com/1030507.
+#if !defined(NDEBUG)
+#define MAYBE_OpenSettingsSubpage DISABLED_OpenSettingsSubpage
+#else
+#define MAYBE_OpenSettingsSubpage OpenSettingsSubpage
+#endif
+IN_PROC_BROWSER_TEST_F(AccessibilityPrivateApiTest, MAYBE_OpenSettingsSubpage) {
   Profile* profile = chromeos::AccessibilityManager::Get()->profile();
 
   // Install the Settings App.