[Sensors] Stop throwing InvalidStateError exceptions

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 46 matching lines @@
           JSMessageSource, InfoMessageLevel, "Frequency is limited to 60 Hz.");
       executionContext->addConsoleMessage(consoleMessage);
     }
   }
 }
 
 Sensor::~Sensor() = default;
 
 void Sensor::start(ScriptState* scriptState, ExceptionState& exceptionState) {
   if (m_state != Sensor::SensorState::Idle &&
-      m_state != Sensor::SensorState::Errored) {
-    exceptionState.throwDOMException(
-        InvalidStateError,
-        "Cannot start because SensorState is not Idle or errored");
+      m_state != Sensor::SensorState::Errored)
     return;
-  }
 
   initSensorProxyIfNeeded();
 
   if (!m_sensorProxy) {
     exceptionState.throwDOMException(
         InvalidStateError, "The Sensor is no longer associated to a frame.");
     return;
   }
   m_lastUpdateTimestamp = WTF::monotonicallyIncreasingTime();
   startListening();
 }
 
 void Sensor::stop(ScriptState*, ExceptionState& exceptionState) {
   if (m_state == Sensor::SensorState::Idle ||
-      m_state == Sensor::SensorState::Errored) {
-    exceptionState.throwDOMException(
-        InvalidStateError,
-        "Cannot stop because SensorState is either Idle or errored");
+      m_state == Sensor::SensorState::Errored)
     return;
-  }
 
   stopListening();
 }
 
 static String ToString(Sensor::SensorState state) {
   switch (state) {
     case Sensor::SensorState::Idle:
       return "idle";
     case Sensor::SensorState::Activating:
       return "activating";
@@ skipping 221 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