Implement BrowserAccessibility accLocation in terms of AXPlatformNodeWin.

content/browser/accessibility/browser_accessibility_win.cc

Index: content/browser/accessibility/browser_accessibility_win.cc
diff --git a/content/browser/accessibility/browser_accessibility_win.cc b/content/browser/accessibility/browser_accessibility_win.cc
index 920eab33a1edc00cc8c56aba59841d2e8b19b018..d4a8d1fa4c3d11eaf568b897239c305326c4c4c1 100644
--- a/content/browser/accessibility/browser_accessibility_win.cc
+++ b/content/browser/accessibility/browser_accessibility_win.cc
@@ -483,20 +483,8 @@ STDMETHODIMP BrowserAccessibilityWin::accLocation(LONG* x_left,
   if (!instance_active())
     return E_FAIL;
 
-  if (!x_left || !y_top || !width || !height)
-    return E_INVALIDARG;
-
-  BrowserAccessibilityWin* target = GetTargetFromChildID(var_id);
-  if (!target)
-    return E_INVALIDARG;
-
-  gfx::Rect bounds = target->GetScreenBoundsRect();
-  *x_left = bounds.x();
-  *y_top  = bounds.y();
-  *width  = bounds.width();
-  *height = bounds.height();
-
-  return S_OK;
+  return GetPlatformNodeWin()->accLocation(x_left, y_top, width, height,
+                                           var_id);
 }
 
 STDMETHODIMP BrowserAccessibilityWin::accNavigate(LONG nav_dir,
@@ -5037,6 +5025,11 @@ void BrowserAccessibilityWin::FireNativeEvent(LONG win_event_type) const {
       this))->Fire();
 }
 
+ui::AXPlatformNodeWin* BrowserAccessibilityWin::GetPlatformNodeWin() const {
+  DCHECK(platform_node_);
+  return static_cast<ui::AXPlatformNodeWin*>(platform_node_);
+}
+
 void BrowserAccessibilityWin::InitRoleAndState() {
   int32_t ia_role = 0;
   int32_t ia_state = 0;