AmbientLightSensor: Remove unnecessary Trace() override.

This method is just calling its parent's implementation, so there is no need
for it.

Change-Id: I32bcab5f4f9af63947b3fff87fb276a321845ef5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1851708
Auto-Submit: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Rijubrata Bhaumik <rijubrata.bhaumik@intel.com>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704680}

third_party/blink/renderer/modules/sensor/ambient_light_sensor.cc

@@ -42,8 +42,4 @@ double AmbientLightSensor::illuminance(bool& is_null) const {
   return GetReading().als.value;
 }
 
-void AmbientLightSensor::Trace(blink::Visitor* visitor) {
-  Sensor::Trace(visitor);
-}
-
 }  // namespace blink

third_party/blink/renderer/modules/sensor/ambient_light_sensor.h

@@ -21,8 +21,6 @@ class AmbientLightSensor final : public Sensor {
   AmbientLightSensor(ExecutionContext*, const SensorOptions*, ExceptionState&);
 
   double illuminance(bool& is_null) const;
-
-  void Trace(blink::Visitor*) override;
 };
 
 }  // namespace blink