Use a service to create device management backends.

chrome/test/test_url_request_context_getter.h

Index: chrome/test/test_url_request_context_getter.h
diff --git a/chrome/test/test_url_request_context_getter.h b/chrome/test/test_url_request_context_getter.h
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+// Copyright (c) 2010 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.
+
+#ifndef CHROME_TEST_TEST_URL_REQUEST_CONTEXT_GETTER_H_
+#define CHROME_TEST_TEST_URL_REQUEST_CONTEXT_GETTER_H_
+
+#include "base/ref_counted.h"
+#include "chrome/browser/browser_thread.h"
+#include "chrome/common/net/url_request_context_getter.h"
+#include "net/url_request/url_request_unittest.h"
+
+// Used to return a dummy context (normally the context is on the IO thread).
+// The one here can be run on the main test thread. Note that this can lead to
+// a leak if your test does not have a BrowserThread::IO in it because
+// URLRequestContextGetter is defined as a ReferenceCounted object with a
+// special trait that deletes it on the IO thread.
+class TestURLRequestContextGetter : public URLRequestContextGetter {
+ public:
+  virtual URLRequestContext* GetURLRequestContext() {
+    if (!context_)
+      context_ = new TestURLRequestContext();
+    return context_.get();
+  }
+  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() const {
+    return BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO);
+  }
+
+ private:
+  scoped_refptr<URLRequestContext> context_;
+};
+
+#endif  // CHROME_TEST_TEST_URL_REQUEST_CONTEXT_GETTER_H_