Use mojo SystemTray interfaces for both mash and classic ash

chrome/browser/ui/ash/ash_init.cc

Index: chrome/browser/ui/ash/ash_init.cc
diff --git a/chrome/browser/ui/ash/ash_init.cc b/chrome/browser/ui/ash/ash_init.cc
index 6e7ebd3923de3569a1c1d80fb7127d7fdd9bb1ba..b825949934076da0955615da6e71138d270862db 100644
--- a/chrome/browser/ui/ash/ash_init.cc
+++ b/chrome/browser/ui/ash/ash_init.cc
@@ -34,6 +34,7 @@
 #include "chromeos/login/login_state.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/context_factory.h"
+#include "content/public/common/mojo_shell_connection.h"
 #include "ui/aura/env.h"
 #include "ui/aura/window_tree_host.h"
 
@@ -65,6 +66,9 @@ void OpenAsh(gfx::AcceleratedWidget remote_window) {
   shell_init_params.delegate = new ChromeShellDelegate;
   shell_init_params.context_factory = content::GetContextFactory();
   shell_init_params.blocking_pool = content::BrowserThread::GetBlockingPool();
+  shell_init_params.connector =
+      content::MojoShellConnection::GetForProcess()->GetConnector();
+  DCHECK(shell_init_params.connector);
 
   ash::Shell* shell = ash::Shell::CreateInstance(shell_init_params);
   shell->accelerator_controller_delegate()->SetScreenshotDelegate(