Move application_manager from /mojo to /shell.

mojo/application_manager/application_loader.cc

-// 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 "mojo/application_manager/application_loader.h"
-
-#include "base/bind.h"
-#include "base/logging.h"
-
-namespace mojo {
-
-namespace {
-
-void NotReached(const GURL& url,
-                ScopedMessagePipeHandle shell_handle,
-                URLResponsePtr response) {
-  NOTREACHED();
-}
-
-}  // namespace
-
-ApplicationLoader::LoadCallback ApplicationLoader::SimpleLoadCallback() {
-  return base::Bind(&NotReached);
-}
-
-}  // namespace mojo