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

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index c56d426445c04239ed4cdbe4a5439a62eeda33b4..1f5f4e1392deadd18453d4e7160f07f7d2e40927 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -1216,7 +1216,7 @@ int BrowserMainLoop::BrowserThreadsStarted() {
       // TODO(rockot): Remove the blocking wait for init.
       // http://crbug.com/594852.
       WaitForMojoShellInitialize();
-      views::WindowManagerConnection::Create(
+      window_manager_connection_ = views::WindowManagerConnection::Create(
           mojo_shell_connection->GetConnector(),
           mojo_shell_connection->GetIdentity());
     }