views/mus: Have explicit ownership of views::WindowManagerConnection.

services/navigation/content_client/browser_main_parts.cc

Index: services/navigation/content_client/browser_main_parts.cc
diff --git a/services/navigation/content_client/browser_main_parts.cc b/services/navigation/content_client/browser_main_parts.cc
index 857d7e9579b1c0f76f352b0e1989376f32eea2aa..242241c9ef7d402a3cfb75d06e5aa0d3f56972a7 100644
--- a/services/navigation/content_client/browser_main_parts.cc
+++ b/services/navigation/content_client/browser_main_parts.cc
@@ -27,7 +27,7 @@ void BrowserMainParts::PreMainMessageLoopRun() {
   content::MojoShellConnection* mojo_shell_connection =
       content::MojoShellConnection::Get();
   if (mojo_shell_connection) {
-    views::WindowManagerConnection::Create(
+    window_manager_connection_ = views::WindowManagerConnection::Create(
         mojo_shell_connection->GetConnector(),
         mojo_shell_connection->GetIdentity());
   }