[sensors] [mac] Implement ambient light sensor for macOS

content/browser/device_sensors/data_fetcher_shared_memory.h

Index: content/browser/device_sensors/data_fetcher_shared_memory.h
diff --git a/content/browser/device_sensors/data_fetcher_shared_memory.h b/content/browser/device_sensors/data_fetcher_shared_memory.h
index 85afac4b30d48ea8d40e630abfd0086cc3a3042b..fb11e523b844037d138c054b2bf2daa7fbf07131 100644
--- a/content/browser/device_sensors/data_fetcher_shared_memory.h
+++ b/content/browser/device_sensors/data_fetcher_shared_memory.h
@@ -17,6 +17,9 @@
 
 #if defined(OS_MACOSX)
 class SuddenMotionSensor;
+namespace device {
+class AmbientLightSensor;
+}
 #elif defined(OS_WIN)
 #include <SensorsApi.h>
 #include "base/win/scoped_comptr.h"
@@ -26,8 +29,6 @@ namespace content {
 
 #if defined(OS_CHROMEOS)
 class SensorManagerChromeOS;
-#elif defined(OS_MACOSX)
-class AmbientLightSensor;
 #endif
 
 class CONTENT_EXPORT DataFetcherSharedMemory
@@ -60,7 +61,7 @@ class CONTENT_EXPORT DataFetcherSharedMemory
   void Fetch(unsigned consumer_bitmask) override;
   FetcherType GetType() const override;
 
-  std::unique_ptr<AmbientLightSensor> ambient_light_sensor_;
+  std::unique_ptr<device::AmbientLightSensor> ambient_light_sensor_;
   std::unique_ptr<SuddenMotionSensor> sudden_motion_sensor_;
 #elif defined(OS_WIN)
   class SensorEventSink;