Cleanup mojo_shell and sample_app a bit

mojo/shell/loader.cc

+// Copyright 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.
+
+#include "mojo/shell/loader.h"
+
+#include "base/message_loop/message_loop.h"
+
+namespace mojo {
+namespace shell {
+
+namespace {
+
+scoped_ptr<base::Thread> CreateIOThread(const char* name) {
+  scoped_ptr<base::Thread> thread(new base::Thread(name));
+  base::Thread::Options options;
+  options.message_loop_type = base::MessageLoop::TYPE_IO;
+  thread->StartWithOptions(options);
+  return thread.Pass();
+}
+
+}  // namespace
+
+Loader::Delegate::~Delegate() {
+}
+
+Loader::Job::Job(const GURL& app_url, Delegate* delegate)
+    : delegate_(delegate) {
+  fetcher_.reset(net::URLFetcher::Create(app_url, net::URLFetcher::GET, this));
+}
+
+Loader::Job::~Job() {
+}
+
+void Loader::Job::OnURLFetchComplete(const net::URLFetcher* source) {
+  base::FilePath app_path;
+  source->GetResponseAsFilePath(true, &app_path);
+  delegate_->DidCompleteLoad(source->GetURL(), app_path);
+}
+
+Loader::Loader(base::SingleThreadTaskRunner* network_runner,
+               base::SingleThreadTaskRunner* file_runner,
+               base::FilePath base_path)
+    : file_runner_(file_runner),
+      cache_thread_(CreateIOThread("cache_thread")),
+      url_request_context_getter_(new URLRequestContextGetter(
+          base_path, network_runner, cache_thread_->message_loop_proxy())) {
+}
+
+Loader::~Loader() {
+}
+
+scoped_ptr<Loader::Job> Loader::Load(const GURL& app_url, Delegate* delegate) {
+  scoped_ptr<Job> job(new Job(app_url, delegate));
+  job->fetcher_->SetRequestContext(url_request_context_getter_.get());
+  job->fetcher_->SaveResponseToTemporaryFile(file_runner_.get());
+  job->fetcher_->Start();
+  return job.Pass();
+}
+
+}  // namespace shell
+}  // namespace mojo