Fix data fetcher for light stop correctly on windows.

SetBufferAvailableState was from called DataFetcherSharedMemory::Stop for all
cases including TYPE_LIGHT, but for light, we are not using it as
we are using SetLightBuffer(light_buffer_, -1);

BUG=474586

Review URL: https://codereview.chromium.org/1064863002

Cr-Commit-Position: refs/heads/master@{#324044}

content/browser/device_sensors/data_fetcher_shared_memory_win.cc

@@ -341,12 +341,13 @@ bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) {
 
 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: