Fix the indirect pure virtual calls in DataFetcherSharedMemoryBase destructor.

content/browser/device_sensors/data_fetcher_shared_memory_base.h

Index: content/browser/device_sensors/data_fetcher_shared_memory_base.h
diff --git a/content/browser/device_sensors/data_fetcher_shared_memory_base.h b/content/browser/device_sensors/data_fetcher_shared_memory_base.h
index c959e8254fd6dfadb922289ce75e8e246663a1ec..fc1f031d49919785168247a0275b2b45113b7254 100644
--- a/content/browser/device_sensors/data_fetcher_shared_memory_base.h
+++ b/content/browser/device_sensors/data_fetcher_shared_memory_base.h
@@ -31,6 +31,10 @@ class CONTENT_EXPORT DataFetcherSharedMemoryBase {
   // relevant sensors could be successfully deactivated.
   bool StopFetchingDeviceData(ConsumerType consumer_type);
 
+  // Should be called before destruction to make sure all active
+  // sensors are unregistered.
+  void StopFetchingAllDeviceData();
+
   // Returns the shared memory handle of the device sensor data
   // duplicated into the given process. This method should only be
   // called after a call to StartFetchingDeviceData method with