[Sensors] start() and stop() methods do not throw

third_party/WebKit/Source/modules/sensor/Sensor.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/sensor/Sensor.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContextTask.h"
 #include "core/dom/TaskRunnerHelper.h"
@@ skipping 44 matching lines @@
       m_sensorOptions.setFrequency(SensorConfiguration::kMaxAllowedFrequency);
       ConsoleMessage* consoleMessage = ConsoleMessage::create(
           JSMessageSource, InfoMessageLevel, "Frequency is limited to 60 Hz.");
       executionContext->addConsoleMessage(consoleMessage);
     }
   }
 }
 
 Sensor::~Sensor() = default;
 
-void Sensor::start(ScriptState* scriptState, ExceptionState& exceptionState) {
+void Sensor::start() {
   if (m_state != Sensor::SensorState::Unconnected &&
       m_state != Sensor::SensorState::Idle &&
       m_state != Sensor::SensorState::Errored)
     return;
 
   initSensorProxyIfNeeded();
-
   if (!m_sensorProxy) {
-    exceptionState.throwDOMException(
-        InvalidStateError, "The Sensor is no longer associated to a frame.");
+    reportError(InvalidStateError,
+                "The Sensor is no longer associated to a frame.");
     return;
   }
+
   m_lastUpdateTimestamp = WTF::monotonicallyIncreasingTime();
   startListening();
 }
 
-void Sensor::stop(ScriptState*, ExceptionState& exceptionState) {
+void Sensor::stop() {
   if (m_state == Sensor::SensorState::Unconnected ||
       m_state == Sensor::SensorState::Idle ||
       m_state == Sensor::SensorState::Errored)
     return;
 
   stopListening();
 }
 
 static String ToString(Sensor::SensorState state) {
   switch (state) {
@@ skipping 228 matching lines @@
 }
 
 bool Sensor::canReturnReadings() const {
   if (m_state != Sensor::SensorState::Activated)
     return false;
   DCHECK(m_sensorProxy);
   return m_sensorProxy->reading().timestamp != 0.0;
 }
 
 }  // namespace blink