Fix overflow in user traffic content type histogram

components/data_use_measurement/core/data_use_measurement.h

 // 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_CONTENT_DATA_USE_MEASUREMENT_H_
 #define COMPONENTS_DATA_USE_MEASUREMENT_CONTENT_DATA_USE_MEASUREMENT_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 176 matching lines @@
   int64_t bytes_transferred_since_last_traffic_stats_query_;
 
   // The time at which Chromium app state changed to background. Can be null if
   // app is not in background.
   base::TimeTicks last_app_background_time_;
 
   // True if app is in background and first network read has not yet happened.
   bool no_reads_since_background_;
 #endif
 
+  // User traffic data use by content type is logged in 1KB increments. The
+  // remaining bytes are saved in this array until logged next time.
+  int16_t user_traffic_content_type_bytes_[DataUseUserData::TYPE_MAX];
+
   DISALLOW_COPY_AND_ASSIGN(DataUseMeasurement);
 };
 
 }  // namespace data_use_measurement
 
 #endif  // COMPONENTS_DATA_USE_MEASUREMENT_CONTENT_DATA_USE_MEASUREMENT_H_