[Presentation API] Fix use-after-free.

This fixes a potential UAF in PresentationConnectionCallbacks::OnSuccess.

Bug: 1116706
Change-Id: I25fc55edf968f41bfedecbeb2054a5eae56d0de7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2361025Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799342}

third_party/blink/renderer/modules/presentation/presentation_connection_callbacks.cc

@@ -64,9 +64,10 @@ void PresentationConnectionCallbacks::OnSuccess(
         resolver_.Get(), presentation_info, request_);
   }
 
-  resolver_->Resolve(connection_);
   connection_->Init(std::move(connection_remote),
                     std::move(connection_receiver));
+
+  resolver_->Resolve(connection_);
 }
 
 void PresentationConnectionCallbacks::OnError(