Add hack so VoiceOver speaks updates to injected live regions.

content/browser/accessibility/browser_accessibility_manager_mac.h

Index: content/browser/accessibility/browser_accessibility_manager_mac.h
diff --git a/content/browser/accessibility/browser_accessibility_manager_mac.h b/content/browser/accessibility/browser_accessibility_manager_mac.h
index 4659ff510afe211f1b708849082ec60294ff0673..fb2a0eb47b0b1f4cfeee3aa0e097f6c096de4893 100644
--- a/content/browser/accessibility/browser_accessibility_manager_mac.h
+++ b/content/browser/accessibility/browser_accessibility_manager_mac.h
@@ -31,12 +31,17 @@ class CONTENT_EXPORT BrowserAccessibilityManagerMac
   NSView* parent_view() { return parent_view_; }
 
  private:
+  virtual void OnNodeCreationFinished(ui::AXNode* node) OVERRIDE;
+  virtual void OnTreeUpdateFinished() OVERRIDE;
+
   // This gives BrowserAccessibilityManager::Create access to the class
   // constructor.
   friend class BrowserAccessibilityManager;
 
   NSView* parent_view_;
 
+  bool created_live_region_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManagerMac);
 };