Move web modal dialog manager files into the constrained_window component.

extensions/shell/browser/shell_web_contents_modal_dialog_manager.cc

Index: extensions/shell/browser/shell_web_contents_modal_dialog_manager.cc
diff --git a/extensions/shell/browser/shell_web_contents_modal_dialog_manager.cc b/extensions/shell/browser/shell_web_contents_modal_dialog_manager.cc
deleted file mode 100644
index 266f37960dfc8ffa4f482861fd42b3cb24f21708..0000000000000000000000000000000000000000
--- a/extensions/shell/browser/shell_web_contents_modal_dialog_manager.cc
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2014 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 "components/web_modal/web_contents_modal_dialog_manager.h"
-
-namespace web_modal {
-
-SingleWebContentsDialogManager*
-WebContentsModalDialogManager::CreateNativeWebModalManager(
-    gfx::NativeWindow dialog,
-    SingleWebContentsDialogManagerDelegate* native_delegate) {
-  // TODO(oshima): Investigate if we need to implement this.
-  NOTREACHED();
-  return NULL;
-}
-
-}  // namespace web_modal