Remove DeviceLightEvent implementation

device/sensors/data_fetcher_shared_memory_chromeos.cc

Index: device/sensors/data_fetcher_shared_memory_chromeos.cc
diff --git a/device/sensors/data_fetcher_shared_memory_chromeos.cc b/device/sensors/data_fetcher_shared_memory_chromeos.cc
index ee12c57255a14abb3c21dd671accfd0c90d7118c..1e63fe62a82b615625c95c500157dcc481318bc4 100644
--- a/device/sensors/data_fetcher_shared_memory_chromeos.cc
+++ b/device/sensors/data_fetcher_shared_memory_chromeos.cc
@@ -38,9 +38,6 @@ bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) {
       orientation_absolute_buffer_->seqlock.WriteEnd();
       return false;
     }
-    case CONSUMER_TYPE_LIGHT:
-      NOTIMPLEMENTED();
-      return false;
   }
   NOTREACHED();
   return false;
@@ -61,9 +58,6 @@ bool DataFetcherSharedMemory::Stop(ConsumerType consumer_type) {
         orientation_absolute_buffer_ = nullptr;
       }
       return true;
-    case CONSUMER_TYPE_LIGHT:
-      NOTIMPLEMENTED();
-      return false;
   }
   NOTREACHED();
   return false;