Move apps/shell to extensions/shell.

apps/shell/browser/shell_extension_web_contents_observer.cc

Index: apps/shell/browser/shell_extension_web_contents_observer.cc
diff --git a/apps/shell/browser/shell_extension_web_contents_observer.cc b/apps/shell/browser/shell_extension_web_contents_observer.cc
deleted file mode 100644
index 0c8c29e0b17ff0253d354e61d1555feac6b28a26..0000000000000000000000000000000000000000
--- a/apps/shell/browser/shell_extension_web_contents_observer.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 "apps/shell/browser/shell_extension_web_contents_observer.h"
-
-DEFINE_WEB_CONTENTS_USER_DATA_KEY(
-    extensions::ShellExtensionWebContentsObserver);
-
-namespace extensions {
-
-ShellExtensionWebContentsObserver::ShellExtensionWebContentsObserver(
-    content::WebContents* web_contents)
-    : ExtensionWebContentsObserver(web_contents) {}
-
-ShellExtensionWebContentsObserver::~ShellExtensionWebContentsObserver() {}
-
-}  // namespace extensions