Revert of Send Windows accessibility events based on tree updates.

content/browser/accessibility/browser_accessibility_win.h

Index: content/browser/accessibility/browser_accessibility_win.h
diff --git a/content/browser/accessibility/browser_accessibility_win.h b/content/browser/accessibility/browser_accessibility_win.h
index 305dabaffedede3b90650f954c2e256505f7dd9f..cd339d53c911f76d76f9266b661ed7b3b7db9b6a 100644
--- a/content/browser/accessibility/browser_accessibility_win.h
+++ b/content/browser/accessibility/browser_accessibility_win.h
@@ -97,15 +97,11 @@
   // like NotifyWinEvent, and as the unique ID for IAccessible2 and ISimpleDOM.
   LONG unique_id_win() const { return unique_id_win_; }
 
-  CONTENT_EXPORT void UpdateIAccessibleText();
-
   //
   // BrowserAccessibility methods.
   //
   CONTENT_EXPORT virtual void OnDataChanged() override;
   CONTENT_EXPORT virtual void OnUpdateFinished() override;
-  CONTENT_EXPORT virtual void OnSubtreeWillBeDeleted() override;
-  CONTENT_EXPORT virtual void OnSubtreeCreationFinished() override;
   CONTENT_EXPORT virtual void NativeAddReference() override;
   CONTENT_EXPORT virtual void NativeReleaseReference() override;
   CONTENT_EXPORT virtual bool IsNative() const override;
@@ -779,18 +775,14 @@
                          void** object);
 
   // Accessors.
-  int32 ia_role() const { return win_attributes_->ia_role; }
-  int32 ia_state() const { return win_attributes_->ia_state; }
-  const base::string16& role_name() const { return win_attributes_->role_name; }
-  int32 ia2_role() const { return win_attributes_->ia2_role; }
-  int32 ia2_state() const { return win_attributes_->ia2_state; }
+  int32 ia_role() const { return ia_role_; }
+  int32 ia_state() const { return ia_state_; }
+  const base::string16& role_name() const { return role_name_; }
+  int32 ia2_role() const { return ia2_role_; }
+  int32 ia2_state() const { return ia2_state_; }
   const std::vector<base::string16>& ia2_attributes() const {
-    return win_attributes_->ia2_attributes;
-  }
-  base::string16 name() const { return win_attributes_->name; }
-  base::string16 description() const { return win_attributes_->description; }
-  base::string16 help() const { return win_attributes_->help; }
-  base::string16 value() const { return win_attributes_->value; }
+    return ia2_attributes_;
+  }
 
  private:
   // Add one to the reference count and return the same object. Always
@@ -831,9 +823,6 @@
   void IntAttributeToIA2(ui::AXIntAttribute attribute,
                          const char* ia2_attr);
 
-  // Append the accessible name from this node and its children.
-  base::string16 GetNameRecursive() const;
-
   // Get the value text, which might come from the floating-point
   // value for some roles.
   base::string16 GetValueText();
@@ -841,9 +830,6 @@
   // Get the text of this node for the purposes of IAccessibleText - it may
   // be the name, it may be the value, etc. depending on the role.
   base::string16 TextForIAccessibleText();
-
-  void ComputeHypertextRemovedAndInserted(
-      int* start, int* old_len, int* new_len);
 
   // If offset is a member of IA2TextSpecialOffsets this function updates the
   // value of offset and returns, otherwise offset remains unchanged.
@@ -869,40 +855,37 @@
   // IAccessible2 and ISimpleDOM.
   LONG unique_id_win_;
 
-  struct WinAttributes {
-    WinAttributes();
-
-    // IAccessible role and state.
-    int32 ia_role;
-    int32 ia_state;
-    base::string16 role_name;
-
-    // IAccessible name, description, help, value.
-    base::string16 name;
-    base::string16 description;
-    base::string16 help;
-    base::string16 value;
-
-    // IAccessible2 role and state.
-    int32 ia2_role;
-    int32 ia2_state;
-
-    // IAccessible2 attributes.
-    std::vector<base::string16> ia2_attributes;
-  };
-
-  scoped_ptr<WinAttributes> win_attributes_;
-
-  // Only valid during the scope of a IA2_EVENT_TEXT_REMOVED or
-  // IA2_EVENT_TEXT_INSERTED event.
-  scoped_ptr<WinAttributes> old_win_attributes_;
+  // IAccessible role and state.
+  int32 ia_role_;
+  int32 ia_state_;
+  base::string16 role_name_;
+
+  // IAccessible2 role and state.
+  int32 ia2_role_;
+  int32 ia2_state_;
+
+  // IAccessible2 attributes.
+  std::vector<base::string16> ia2_attributes_;
+
+  // True in Initialize when the object is first created, and false
+  // subsequent times.
+  bool first_time_;
+
+  // The previous text, before the last update to this object.
+  base::string16 previous_text_;
+
+  // The old text to return in IAccessibleText::get_oldText - this is like
+  // previous_text_ except that it's NOT updated when the object
+  // is initialized again but the text doesn't change.
+  base::string16 old_text_;
+
+  // The previous state, used to see if there was a state change.
+  int32 old_ia_state_;
 
   // Relationships between this node and other nodes.
   std::vector<BrowserAccessibilityRelation*> relations_;
 
-  // IAccessibleText text of this node including
-  // embedded hyperlink characters.
-  base::string16 old_hypertext_;
+  // The text of this node including embedded hyperlink characters.
   base::string16 hypertext_;
 
   // Maps the |hypertext_| embedded character offset to an index in