components: Create web_modal component.

components/web_modal/web_contents_modal_dialog_manager_delegate.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 "chrome/browser/ui/web_contents_modal_dialog_manager_delegate.h"
+#include "components/web_modal/web_contents_modal_dialog_manager_delegate.h"
 
 #include <string.h>
 
+namespace web_modal {
+
 void WebContentsModalDialogManagerDelegate::SetWebContentsBlocked(
     content::WebContents* web_contents, bool blocked) {
 }
 
 WebContentsModalDialogHost*
     WebContentsModalDialogManagerDelegate::GetWebContentsModalDialogHost() {
   return NULL;
 }
 
+bool WebContentsModalDialogManagerDelegate::IsWebContentsVisible(
+    content::WebContents* web_contents) {
+  return true;
+}
+
 WebContentsModalDialogManagerDelegate::~WebContentsModalDialogManagerDelegate(
 ) {}
+
+}  // namespace web_modal