Add initial GTK web accessibility framework (third attempt).

content/browser/accessibility/browser_accessibility_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <Cocoa/Cocoa.h>
 
 #import "content/browser/accessibility/browser_accessibility_mac.h"
 
 #import "content/browser/accessibility/browser_accessibility_cocoa.h"
 #import "content/browser/accessibility/browser_accessibility_delegate_mac.h"
@@ skipping 29 matching lines @@
     // Relinquish ownership of the cocoa obj.
     [temp release];
     // At this point, other processes may have a reference to
     // the cocoa object. When the retain count hits zero, it will
     // destroy us in dealloc.
     // For that reason, do *not* make any more calls here after
     // as we might have been deleted.
   }
 }
 
+bool BrowserAccessibilityMac::IsNative() const {
+  return true;
+}
+
 void BrowserAccessibilityMac::DetachTree(
     std::vector<BrowserAccessibility*>* nodes) {
   [browser_accessibility_cocoa_ childrenChanged];
   BrowserAccessibility::DetachTree(nodes);
 }
 
-BrowserAccessibilityCocoa* BrowserAccessibility::toBrowserAccessibilityCocoa() {
+BrowserAccessibilityCocoa* BrowserAccessibility::ToBrowserAccessibilityCocoa() {
   return static_cast<BrowserAccessibilityMac*>(this)->
       native_view();
 }