Rename AXObject to AXObjectImpl in modules/ and web/

third_party/WebKit/Source/modules/accessibility/AXTable.h

Index: third_party/WebKit/Source/modules/accessibility/AXTable.h
diff --git a/third_party/WebKit/Source/modules/accessibility/AXTable.h b/third_party/WebKit/Source/modules/accessibility/AXTable.h
index f9c902403b045a03d6dacf7af44e1c08b89a7740..cd22e7d89f91cdaeb0d9c3a990ed7ce5e5325dc1 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXTable.h
+++ b/third_party/WebKit/Source/modules/accessibility/AXTable.h
@@ -77,13 +77,13 @@ class MODULES_EXPORT AXTable : public AXLayoutObject {
   void RowHeaders(AXObjectVector&);
 
   // an object that contains, as children, all the objects that act as headers
-  AXObject* HeaderContainer();
+  AXObjectImpl* HeaderContainer();
 
  protected:
   AXObjectVector rows_;
   AXObjectVector columns_;
 
-  Member<AXObject> header_container_;
+  Member<AXObjectImpl> header_container_;
   bool is_ax_table_;
 
   bool HasARIARole() const;