Add initial GTK web accessibility framework (new with valgrind fix).

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
===================================================================
--- content/browser/renderer_host/render_widget_host_view_mac.mm	(revision 135549)
+++ content/browser/renderer_host/render_widget_host_view_mac.mm	(working copy)
@@ -20,6 +20,7 @@
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #import "content/browser/accessibility/browser_accessibility_cocoa.h"
+#import "content/browser/accessibility/browser_accessibility_mac.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/plugin_process_host.h"
 #import "content/browser/renderer_host/accelerated_plugin_view_mac.h"
@@ -2106,7 +2107,7 @@
           [attribute isEqualToString:NSAccessibilityContentsAttribute]) &&
       manager) {
     return [NSArray arrayWithObjects:manager->
-        GetRoot()->toBrowserAccessibilityCocoa(), nil];
+        GetRoot()->ToBrowserAccessibilityMac()->native_view(), nil];
   } else if ([attribute isEqualToString:NSAccessibilityRoleAttribute]) {
     return NSAccessibilityScrollAreaRole;
   }
@@ -2129,7 +2130,7 @@
   localPoint.y = NSHeight([self bounds]) - localPoint.y;
   BrowserAccessibilityCocoa* root = renderWidgetHostView_->
       GetBrowserAccessibilityManager()->
-          GetRoot()->toBrowserAccessibilityCocoa();
+          GetRoot()->ToBrowserAccessibilityMac()->native_view();
   id obj = [root accessibilityHitTest:localPoint];
   return obj;
 }
@@ -2143,7 +2144,7 @@
       renderWidgetHostView_->GetBrowserAccessibilityManager();
   // Only child is root.
   if (manager &&
-      manager->GetRoot()->toBrowserAccessibilityCocoa() == child) {
+      manager->GetRoot()->ToBrowserAccessibilityMac()->native_view() == child) {
     return 0;
   } else {
     return NSNotFound;
@@ -2158,7 +2159,7 @@
     DCHECK(focused_item);
     if (focused_item) {
       BrowserAccessibilityCocoa* focused_item_cocoa =
-          focused_item->toBrowserAccessibilityCocoa();
+          focused_item->ToBrowserAccessibilityMac()->native_view();
       DCHECK(focused_item_cocoa);
       if (focused_item_cocoa)
         return focused_item_cocoa;