Extract minimal RenderViewHost interface for embedders, leaving

chrome/browser/accessibility/accessibility_win_browsertest.cc

 // 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.
 
 #include <atlbase.h>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/utf_string_conversions.h"
 #include "base/win/scoped_comptr.h"
@@ skipping 177 matching lines @@
       if (*found)
         return;
     }
   }
 }
 
 // Retrieve the MSAA client accessibility object for the Render Widget Host View
 // of the selected tab.
 IAccessible*
 AccessibilityWinBrowserTest::GetRendererAccessible() {
-  browser()->GetSelectedWebContents()->GetRenderViewHost()->
+  // TODO(joi): Remove this dependency.
+  static_cast<RenderViewHostImpl*>(
+      browser()->GetSelectedWebContents()->GetRenderViewHost())->
       set_send_accessibility_updated_notifications(true);
 
   HWND hwnd_render_widget_host_view =
       browser()->GetSelectedWebContents()->GetRenderWidgetHostView()->
           GetNativeView();
 
   // Invoke windows screen reader detection by sending the WM_GETOBJECT message
   // with kIdCustom as the LPARAM.
   const int32 kIdCustom = 1;
   SendMessage(
@@ skipping 547 matching lines @@
 
   // Check the browser's copy of the renderer accessibility tree.
   AccessibleChecker grouping1_checker(L"", ROLE_SYSTEM_GROUPING, L"");
   AccessibleChecker grouping2_checker(L"", ROLE_SYSTEM_GROUPING, L"");
   AccessibleChecker document_checker(L"", ROLE_SYSTEM_DOCUMENT, L"");
   document_checker.AppendExpectedChild(&grouping1_checker);
   document_checker.AppendExpectedChild(&grouping2_checker);
   document_checker.CheckAccessible(GetRendererAccessible());
 }
 }  // namespace.