Complete the layered architecture of data_use_measurement component.

components/data_use_measurement/core/data_use_measurement_delegate.h

Index: components/data_use_measurement/core/data_use_measurement_delegate.h
diff --git a/components/data_use_measurement/core/data_use_measurement_delegate.h b/components/data_use_measurement/core/data_use_measurement_delegate.h
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+++ b/components/data_use_measurement/core/data_use_measurement_delegate.h
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+// Copyright 2015 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 COMPONENTS_DATA_USE_MEASUREMENT_CORE_DATA_USE_MEASUREMENT_DELEGATE_H_
+#define COMPONENTS_DATA_USE_MEASUREMENT_CORE_DATA_USE_MEASUREMENT_DELEGATE_H_
+
+#include "base/macros.h"
+
+namespace net {
+class URLRequest;
+}
+
+namespace data_use_measurement {
+
+class DataUseMeasurementDelegate {
+ public:
+  DataUseMeasurementDelegate();
+  ~DataUseMeasurementDelegate();
+
+  virtual bool RequestIsFromUser(const net::URLRequest* request) = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(DataUseMeasurementDelegate);
+};
+
+}  // namespace data_use_measurement
+
+#endif  // COMPONENTS_DATA_USE_MEASUREMENT_CORE_DATA_USE_MEASUREMENT_DELEGATE_H_