Re-enable modal dialog in iframe tests.

content/browser/accessibility/dump_accessibility_tree_browsertest.cc

Index: content/browser/accessibility/dump_accessibility_tree_browsertest.cc
diff --git a/content/browser/accessibility/dump_accessibility_tree_browsertest.cc b/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
index 3e73d71159c88d81bda553dfd6519f0303d4dfd9..3f2e31ff6526438eb57dda375afbc351d7cb4775 100644
--- a/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
+++ b/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
@@ -1297,22 +1297,13 @@ IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
   RunHtmlTest(FILE_PATH_LITERAL("modal-dialog-opened.html"));
 }
 
-// Flaky: crbug.com/593846, crbug.com/596514
 IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
-                       DISABLED_AccessibilityModalDialogInIframeClosed) {
+                       AccessibilityModalDialogInIframeClosed) {
   RunHtmlTest(FILE_PATH_LITERAL("modal-dialog-in-iframe-closed.html"));
 }
 
-// Flaky on Windows and Mac: crbug.com/593846
-#if defined(OS_WIN) || defined(OS_MACOSX)
-#define MAYBE_AccessibilityModalDialogInIframeOpened \
-    DISABLED_AccessibilityModalDialogInIframeOpened
-#else
-#define MAYBE_AccessibilityModalDialogInIframeOpened \
-    AccessibilityModalDialogInIframeOpened
-#endif
 IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
-                       MAYBE_AccessibilityModalDialogInIframeOpened) {
+                       AccessibilityModalDialogInIframeOpened) {
   RunHtmlTest(FILE_PATH_LITERAL("modal-dialog-in-iframe-opened.html"));
 }