Disable DumpAccessibilityEventsTest.DeleteSubtree on Linux

TBR=aboxhall@chromium.org

BUG: 990847
Change-Id: I9ac7c2470f77a5b94f4298a0fa5f06e567ea858d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1737089Reviewed-by: Chris Sharp <csharp@chromium.org>
Commit-Queue: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684030}

content/browser/accessibility/dump_accessibility_events_browsertest.cc

@@ -797,7 +797,13 @@ IN_PROC_BROWSER_TEST_P(DumpAccessibilityEventsTest,
   RunEventTest(FILE_PATH_LITERAL("select-selected-add-remove.html"));
 }
 
-IN_PROC_BROWSER_TEST_P(DumpAccessibilityEventsTest, DeleteSubtree) {
+// Test is flaky on Linux. See crbug.com/990847 for more details.
+#if defined(OS_LINUX)
+#define MAYBE_DeleteSubtree DISABLED_DeleteSubtree
+#else
+#define MAYBE_DeleteSubtree DeleteSubtree
+#endif
+IN_PROC_BROWSER_TEST_P(DumpAccessibilityEventsTest, MAYBE_DeleteSubtree) {
   RunEventTest(FILE_PATH_LITERAL("delete-subtree.html"));
 }