Fix data fetcher for light stop correctly on windows.

content/browser/device_sensors/data_fetcher_shared_memory_win.cc

 // Copyright 2014 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 "content/browser/device_sensors/data_fetcher_shared_memory.h"
 
 #include <GuidDef.h>
 #include <InitGuid.h>
 #include <PortableDeviceTypes.h>
 #include <Sensors.h>
@@ skipping 323 matching lines @@
       }
       break;
     default:
       NOTREACHED();
   }
   return false;
 }
 
 bool DataFetcherSharedMemory::Stop(ConsumerType consumer_type) {
   DisableSensors(consumer_type);
-  SetBufferAvailableState(consumer_type, false);
   switch (consumer_type) {
     case CONSUMER_TYPE_ORIENTATION:
+      SetBufferAvailableState(consumer_type, false);
       orientation_buffer_ = nullptr;
       return true;
     case CONSUMER_TYPE_MOTION:
+      SetBufferAvailableState(consumer_type, false);
       motion_buffer_ = nullptr;
       return true;
     case CONSUMER_TYPE_LIGHT:
       SetLightBuffer(light_buffer_, -1);
       light_buffer_ = nullptr;
       return true;
     default:
       NOTREACHED();
   }
   return false;
@@ skipping 95 matching lines @@
         motion_buffer_->data.allAvailableSensorsAreActive = enabled;
         motion_buffer_->seqlock.WriteEnd();
       }
       break;
     default:
       NOTREACHED();
   }
 }
 
 }  // namespace content