Revert "Fix MojoApplicationHost assertion when navigating from RenderProcessGone."

This reverts commit 101f015e.

Causing http://crbug.com/456224.

While this original CL should be fine, it's not; we need
to revert until we understand why.

R=marshall@chromium.org
BUG=456224

Review URL: https://codereview.chromium.org/892463005

Cr-Commit-Position: refs/heads/master@{#315101}

content/browser/renderer_host/render_process_host_impl.cc

@@ -2075,10 +2075,6 @@ void RenderProcessHostImpl::ProcessDied(bool already_dead,
 #endif
   RemoveUserData(kSessionStorageHolderKey);
 
-  // RenderProcessGone handlers might navigate or perform other actions that
-  // require a connection. Ensure that there is one before calling them.
-  mojo_application_host_.reset(new MojoApplicationHost);
-
   IDMap<IPC::Listener>::iterator iter(&listeners_);
   while (!iter.IsAtEnd()) {
     iter.GetCurrentValue()->OnMessageReceived(
@@ -2088,6 +2084,8 @@ void RenderProcessHostImpl::ProcessDied(bool already_dead,
     iter.Advance();
   }
 
+  mojo_application_host_.reset(new MojoApplicationHost);
+
   // It's possible that one of the calls out to the observers might have caused
   // this object to be no longer needed.
   if (delayed_cleanup_needed_)