Fix switch statement in DataFetcherSharedMemory::SetBufferAvailableState.

I noticed this because a Telemetry unittest was triggering the NOTREACHED
during session restore on Windows. I don't know much about this code, but the
fallthroughs certainly look unintentional.

BUG=

Review URL: https://codereview.chromium.org/317163006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275425 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/device_sensors/data_fetcher_shared_memory_win.cc

@@ -384,12 +384,14 @@ void DataFetcherSharedMemory::SetBufferAvailableState(
         orientation_buffer_->data.allAvailableSensorsAreActive = enabled;
         orientation_buffer_->seqlock.WriteEnd();
       }
+      break;
     case CONSUMER_TYPE_MOTION:
       if (motion_buffer_) {
         motion_buffer_->seqlock.WriteBegin();
         motion_buffer_->data.allAvailableSensorsAreActive = enabled;
         motion_buffer_->seqlock.WriteEnd();
       }
+      break;
     default:
       NOTREACHED();
   }