[content shell] change how the main render view is picked for layout tests

content/shell/webkit_test_runner.h

 // 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.
 
 #ifndef CONTENT_SHELL_WEBKIT_TEST_RUNNER_H_
 #define CONTENT_SHELL_WEBKIT_TEST_RUNNER_H_
 
 #include "base/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/renderer/render_view_observer.h"
@@ skipping 49 matching lines @@
       const std::string& utf8_path);
 
   void Display();
 
   void set_proxy(WebTestRunner::WebTestProxyBase* proxy) { proxy_ = proxy; }
 
  private:
   // Message handlers.
   void OnCaptureTextDump(bool as_text, bool printing, bool recursive);
   void OnCaptureImageDump(const std::string& expected_pixel_hash);
-  void OnSetIsMainWindow();
   void OnSetCurrentWorkingDirectory(const FilePath& current_working_directory);
 
   SkCanvas* GetCanvas();
   void PaintRect(const WebKit::WebRect& rect);
   void PaintInvalidatedRegion();
   void DisplayRepaintMask();
 
   scoped_ptr<SkCanvas> canvas_;
   scoped_ptr<WebKit::WebContextMenuData> last_context_menu_data_;
-  bool is_main_window_;
   FilePath current_working_directory_;
 
   WebTestRunner::WebTestProxyBase* proxy_;
 
 
   DISALLOW_COPY_AND_ASSIGN(WebKitTestRunner);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_WEBKIT_TEST_RUNNER_H_