Revert of Migrate accessibility from RenderView to RenderFrame.

content/browser/frame_host/interstitial_page_impl.cc

Index: content/browser/frame_host/interstitial_page_impl.cc
diff --git a/content/browser/frame_host/interstitial_page_impl.cc b/content/browser/frame_host/interstitial_page_impl.cc
index 1a1ed43dc658b6dad433ff43523c804bea6576e6..a4ea2997bf7700fc954a30fb699fe92f427b1852 100644
--- a/content/browser/frame_host/interstitial_page_impl.cc
+++ b/content/browser/frame_host/interstitial_page_impl.cc
@@ -432,13 +432,6 @@
   controller_->delegate()->NotifyNavigationStateChanged(INVALIDATE_TYPE_TITLE);
 }
 
-AccessibilityMode InterstitialPageImpl::GetAccessibilityMode() const {
-  if (web_contents_)
-    return static_cast<WebContentsImpl*>(web_contents_)->GetAccessibilityMode();
-  else
-    return AccessibilityModeOff;
-}
-
 RenderViewHostDelegateView* InterstitialPageImpl::GetDelegateView() {
   return rvh_delegate_view_.get();
 }
@@ -540,11 +533,7 @@
 #if defined(OS_WIN)
 gfx::NativeViewAccessible
 InterstitialPageImpl::GetParentNativeViewAccessible() {
-  if (web_contents_) {
-    WebContentsImpl* wci = static_cast<WebContentsImpl*>(web_contents_);
-    return wci->GetParentNativeViewAccessible();
-  }
-  return NULL;
+  return render_widget_host_delegate_->GetParentNativeViewAccessible();
 }
 #endif