Improve the notifications sent from AXTree updates.

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 c0e59fa1d68548408bbe583a39e5ec8faf056fb4..cb323c9c19adf1718b85330c6026c5a1f6b7a361 100644
--- a/content/browser/accessibility/browser_accessibility_manager.h
+++ b/content/browser/accessibility/browser_accessibility_manager.h
@@ -233,11 +233,12 @@ class CONTENT_EXPORT BrowserAccessibilityManager : public ui::AXTreeDelegate {
 
   // AXTreeDelegate implementation.
   void OnNodeWillBeDeleted(ui::AXNode* node) override;
+  void OnSubtreeWillBeDeleted(ui::AXNode* node) override;
   void OnNodeCreated(ui::AXNode* node) override;
   void OnNodeChanged(ui::AXNode* node) override;
-  void OnNodeCreationFinished(ui::AXNode* node) override;
-  void OnNodeChangeFinished(ui::AXNode* node) override;
-  void OnRootChanged(ui::AXNode* new_root) override {}
+  void OnAtomicUpdateFinished(
+      bool root_changed,
+      const std::vector<ui::AXTreeDelegate::Change>& changes) override;
 
   BrowserAccessibilityDelegate* delegate() const { return delegate_; }
   void set_delegate(BrowserAccessibilityDelegate* delegate) {
@@ -257,9 +258,6 @@ class CONTENT_EXPORT BrowserAccessibilityManager : public ui::AXTreeDelegate {
       BrowserAccessibilityDelegate* delegate,
       BrowserAccessibilityFactory* factory);
 
-  // Called at the end of updating the tree.
-  virtual void OnTreeUpdateFinished() {}
-
  private:
   // The following states keep track of whether or not the
   // on-screen keyboard is allowed to be shown.