[Nearby] Send HTTP response to notifier before invoking callback

Fixes a segfault encountered during manual testing.

Change-Id: I5a8719b8b55dc6475cce522f669c72dda5fd5c92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2370925
Auto-Submit: Josh Nohle <nohle@chromium.org>
Commit-Queue: James Vecore <vecore@google.com>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#800883}

chrome/browser/nearby_sharing/client/nearby_share_client_impl.cc

@@ -385,13 +385,13 @@ void NearbyShareClientImpl::OnFlowSuccess(
     OnApiCallFailed(NearbyShareHttpError::kResponseMalformed);
     return;
   }
-  std::move(result_callback).Run(response);
   notifier_->NotifyOfResponse(response);
+  std::move(result_callback).Run(response);
 }
 
 void NearbyShareClientImpl::OnApiCallFailed(NearbyShareHttpError error) {
+  NS_LOG(ERROR) << "Nearby Share RPC call failed with error " << error;
   std::move(error_callback_).Run(error);
-  NS_LOG(ERROR) << error;
 }
 
 NearbyShareClientFactoryImpl::NearbyShareClientFactoryImpl(