Remove DeviceLightEvent implementation

device/sensors/data_fetcher_shared_memory_mac.cc

Index: device/sensors/data_fetcher_shared_memory_mac.cc
diff --git a/device/sensors/data_fetcher_shared_memory_mac.cc b/device/sensors/data_fetcher_shared_memory_mac.cc
index b06c850ca48b474355c117d2d0cc0eab7b9535d7..b3aa760c055463bfc93ce8e98077edf86eafb3f5 100644
--- a/device/sensors/data_fetcher_shared_memory_mac.cc
+++ b/device/sensors/data_fetcher_shared_memory_mac.cc
@@ -9,30 +9,12 @@
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/single_thread_task_runner.h"
-#include "device/sensors/ambient_light_mac.h"
-#include "device/sensors/public/cpp/device_util_mac.h"
 #include "third_party/sudden_motion_sensor/sudden_motion_sensor_mac.h"
 
 namespace device {
 
 const double kMeanGravity = 9.80665;
 
-void FetchLight(AmbientLightSensor* sensor, DeviceLightHardwareBuffer* buffer) {
-  DCHECK(sensor);
-  DCHECK(buffer);
-  // Macbook pro has 2 lux values, left and right, we take the average.
-  // The raw sensor values are converted to lux using LMUvalueToLux(raw_value)
-  // similar to how it is done in Firefox.
-  uint64_t lux_value[2];
-  if (!sensor->ReadSensorValue(lux_value))
-    return;
-  uint64_t mean = (lux_value[0] + lux_value[1]) / 2;
-  double lux = LMUvalueToLux(mean);
-  buffer->seqlock.WriteBegin();
-  buffer->data.value = lux;
-  buffer->seqlock.WriteEnd();
-}
-
 void FetchMotion(SuddenMotionSensor* sensor,
                  DeviceMotionHardwareBuffer* buffer) {
   DCHECK(sensor);
@@ -117,15 +99,12 @@ DataFetcherSharedMemory::~DataFetcherSharedMemory() {}
 void DataFetcherSharedMemory::Fetch(unsigned consumer_bitmask) {
   DCHECK(GetPollingMessageLoop()->task_runner()->BelongsToCurrentThread());
   DCHECK(consumer_bitmask & CONSUMER_TYPE_ORIENTATION ||
-         consumer_bitmask & CONSUMER_TYPE_MOTION ||
-         consumer_bitmask & CONSUMER_TYPE_LIGHT);
+         consumer_bitmask & CONSUMER_TYPE_MOTION);
 
   if (consumer_bitmask & CONSUMER_TYPE_ORIENTATION)
     FetchOrientation(sudden_motion_sensor_.get(), orientation_buffer_);
   if (consumer_bitmask & CONSUMER_TYPE_MOTION)
     FetchMotion(sudden_motion_sensor_.get(), motion_buffer_);
-  if (consumer_bitmask & CONSUMER_TYPE_LIGHT)
-    FetchLight(ambient_light_sensor_.get(), light_buffer_);
 }
 
 DataFetcherSharedMemory::FetcherType DataFetcherSharedMemory::GetType() const {
@@ -189,20 +168,6 @@ bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) {
       orientation_absolute_buffer_->seqlock.WriteEnd();
       return false;
     }
-    case CONSUMER_TYPE_LIGHT: {
-      if (!ambient_light_sensor_)
-        ambient_light_sensor_ = AmbientLightSensor::Create();
-      bool ambient_light_sensor_available =
-          ambient_light_sensor_.get() != nullptr;
-
-      light_buffer_ = static_cast<DeviceLightHardwareBuffer*>(buffer);
-      if (!ambient_light_sensor_available) {
-        light_buffer_->seqlock.WriteBegin();
-        light_buffer_->data.value = std::numeric_limits<double>::infinity();
-        light_buffer_->seqlock.WriteEnd();
-      }
-      return ambient_light_sensor_available;
-    }
     default:
       NOTREACHED();
   }
@@ -238,14 +203,6 @@ bool DataFetcherSharedMemory::Stop(ConsumerType consumer_type) {
         orientation_absolute_buffer_ = nullptr;
       }
       return true;
-    case CONSUMER_TYPE_LIGHT:
-      if (light_buffer_) {
-        light_buffer_->seqlock.WriteBegin();
-        light_buffer_->data.value = -1;
-        light_buffer_->seqlock.WriteEnd();
-        light_buffer_ = nullptr;
-      }
-      return true;
     default:
       NOTREACHED();
   }