Make DeviceOrientationEvent.prototype.absolute non-nullable

content/browser/device_sensors/data_fetcher_shared_memory_mac.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 "content/browser/device_sensors/data_fetcher_shared_memory.h"
 
 #include <stdint.h>
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
@@ skipping 176 matching lines @@
           sudden_motion_sensor_.get() != nullptr;
 
       orientation_buffer_ =
           static_cast<DeviceOrientationHardwareBuffer*>(buffer);
       UMA_HISTOGRAM_BOOLEAN("InertialSensor.OrientationMacAvailable",
           sudden_motion_sensor_available);
       if (sudden_motion_sensor_available) {
         // On Mac we cannot provide absolute orientation.
         orientation_buffer_->seqlock.WriteBegin();
         orientation_buffer_->data.absolute = false;
-        orientation_buffer_->data.hasAbsolute = true;
         orientation_buffer_->seqlock.WriteEnd();
       } else {
         // No motion sensor available, fire an all-null event.
         orientation_buffer_->seqlock.WriteBegin();
         orientation_buffer_->data.allAvailableSensorsAreActive = true;
         orientation_buffer_->seqlock.WriteEnd();
       }
       return sudden_motion_sensor_available;
     }
     case CONSUMER_TYPE_ORIENTATION_ABSOLUTE: {
@@ skipping 51 matching lines @@
         light_buffer_ = nullptr;
       }
       return true;
     default:
       NOTREACHED();
   }
   return false;
 }
 
 }  // namespace content