Make DeviceOrientationEvent.prototype.absolute non-nullable

content/browser/device_sensors/data_fetcher_shared_memory_mac.cc

Index: content/browser/device_sensors/data_fetcher_shared_memory_mac.cc
diff --git a/content/browser/device_sensors/data_fetcher_shared_memory_mac.cc b/content/browser/device_sensors/data_fetcher_shared_memory_mac.cc
index a9ab2ff1dc288dc2208a81a27fd5b50ac801fb8c..c8b37986c7d8bddeddfc27f1041f48f5a64f568b 100644
--- a/content/browser/device_sensors/data_fetcher_shared_memory_mac.cc
+++ b/content/browser/device_sensors/data_fetcher_shared_memory_mac.cc
@@ -194,7 +194,6 @@ bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) {
         // On Mac we cannot provide absolute orientation.
         orientation_buffer_->seqlock.WriteBegin();
         orientation_buffer_->data.absolute = false;
-        orientation_buffer_->data.hasAbsolute = true;

[philipj_slow, 2016/02/26 03:54:01]

This isn't the cause of the observable change on Mac, it's the below all-null
event that will change.

[timvolodine, 2016/03/01 22:36:25]

right, the change is that it cannot be all-null anymore, but absolute=false with
the rest null, which is fine because sufficient for detection.

         orientation_buffer_->seqlock.WriteEnd();
       } else {
         // No motion sensor available, fire an all-null event.