Fix the indirect pure virtual calls in DataFetcherSharedMemoryBase destructor.

content/browser/device_sensors/device_inertial_sensor_service.cc

Index: content/browser/device_sensors/device_inertial_sensor_service.cc
diff --git a/content/browser/device_sensors/device_inertial_sensor_service.cc b/content/browser/device_sensors/device_inertial_sensor_service.cc
index cf96820649e8810236f867e2af3e32f850db83a7..e4c5a31f99168b24c5dc54977985d7ca21ea9365 100644
--- a/content/browser/device_sensors/device_inertial_sensor_service.cc
+++ b/content/browser/device_sensors/device_inertial_sensor_service.cc
@@ -86,12 +86,17 @@ DeviceInertialSensorService::GetSharedMemoryHandleForProcess(
 }
 
 void DeviceInertialSensorService::Shutdown() {
-  data_fetcher_.reset();
+  if (data_fetcher_) {
+    data_fetcher_->StopFetchingAllDeviceData();
+    data_fetcher_.reset();
+  }
   is_shutdown_ = true;
 }
 
 void DeviceInertialSensorService::SetDataFetcherForTesting(
     DataFetcherSharedMemory* test_data_fetcher) {
+  if (data_fetcher_)
+    data_fetcher_->StopFetchingAllDeviceData();
   data_fetcher_.reset(test_data_fetcher);
 }