components: Create web_modal component.

components/web_modal/web_contents_modal_dialog_host.h

 // Copyright (c) 2013 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_WEB_CONTENTS_MODAL_DIALOG_HOST_H_
-#define CHROME_BROWSER_UI_WEB_CONTENTS_MODAL_DIALOG_HOST_H_
+#ifndef COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_HOST_H_
+#define COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_HOST_H_
 
 #include "ui/gfx/point.h"
 #include "ui/gfx/size.h"
 
+namespace web_modal {
+
 // Observer to be implemented to update web contents modal dialogs when the host
 // indicates their position needs to be changed.
 class WebContentsModalDialogHostObserver {
  public:
   virtual ~WebContentsModalDialogHostObserver();
 
   virtual void OnPositionRequiresUpdate() = 0;
 
  protected:
   WebContentsModalDialogHostObserver();
@@ skipping 14 matching lines @@
   virtual void AddObserver(WebContentsModalDialogHostObserver* observer) = 0;
   virtual void RemoveObserver(WebContentsModalDialogHostObserver* observer) = 0;
 
  protected:
   WebContentsModalDialogHost();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebContentsModalDialogHost);
 };
 
-#endif  // CHROME_BROWSER_UI_WEB_CONTENTS_MODAL_DIALOG_HOST_H_
+}  // namespace web_modal
+
+#endif  // COMPONENTS_WEB_MODAL_WEB_CONTENTS_MODAL_DIALOG_HOST_H_