Re-enable 3 DumpAccessibilityEvents tests that were disabled on windows.

content/browser/accessibility/browser_accessibility_manager.h

Index: content/browser/accessibility/browser_accessibility_manager.h
diff --git a/content/browser/accessibility/browser_accessibility_manager.h b/content/browser/accessibility/browser_accessibility_manager.h
index a0bb255b8e5320ee1e69bfa70b61bb9d939afd7a..6bd0d1b1d1c04f39ba14d51e7013f64c28e5a224 100644
--- a/content/browser/accessibility/browser_accessibility_manager.h
+++ b/content/browser/accessibility/browser_accessibility_manager.h
@@ -441,6 +441,11 @@ class CONTENT_EXPORT BrowserAccessibilityManager : public ui::AXTreeDelegate {
   // A mapping from a node id to its wrapper of type BrowserAccessibility.
   base::hash_map<int32_t, BrowserAccessibility*> id_wrapper_map_;
 
+  // A list of accessibility events to fire based on changes to the
+  // accessibility tree. Only used within the scope of one call to
+  // OnAccessibilityEvents, so it's safe to store raw pointers.
+  std::vector<std::pair<ui::AXEvent, BrowserAccessibility*>> tree_events_;
+
   // True if the user has initiated a navigation to another page.
   bool user_is_navigating_away_;