components: Create web_modal component.

chrome/browser/ui/views/constrained_window_views.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 CHROME_BROWSER_UI_VIEWS_CONSTRAINED_WINDOW_VIEWS_H_
 #define CHROME_BROWSER_UI_VIEWS_CONSTRAINED_WINDOW_VIEWS_H_
 
 #include "ui/gfx/native_widget_types.h"
 
+namespace web_modal {
 class WebContentsModalDialogHost;
+}
 
 namespace content {
 class WebContents;
 class BrowserContext;
 }
 namespace views {
 class NonClientFrameView;
 class WidgetDelegate;
 class Widget;
 }
 
 views::Widget* CreateWebContentsModalDialogViews(
     views::WidgetDelegate* widget_delegate,
     gfx::NativeView parent,
-    WebContentsModalDialogHost* dialog_host);
+    web_modal::WebContentsModalDialogHost* dialog_host);
 
 views::NonClientFrameView* CreateConstrainedStyleNonClientFrameView(
     views::Widget* widget,
     content::BrowserContext* browser_context);
 
 #endif  // CHROME_BROWSER_UI_VIEWS_CONSTRAINED_WINDOW_VIEWS_H_