Promotes more accessors from WmShell to Shell

remoting/host/disconnect_window_chromeos.cc

Index: remoting/host/disconnect_window_chromeos.cc
diff --git a/remoting/host/disconnect_window_chromeos.cc b/remoting/host/disconnect_window_chromeos.cc
index bb4b8ffea2176dafdedbeac1f93558a9a4adcb00..16efcf98447c7b62c193001b9ca57c2fdd179988 100644
--- a/remoting/host/disconnect_window_chromeos.cc
+++ b/remoting/host/disconnect_window_chromeos.cc
@@ -5,7 +5,7 @@
 #include <string>
 
 #include "ash/common/system/tray/system_tray_notifier.h"
-#include "ash/common/wm_shell.h"
+#include "ash/shell.h"
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ -32,7 +32,7 @@ class DisconnectWindowAura : public HostWindow {
 DisconnectWindowAura::DisconnectWindowAura() {}
 
 DisconnectWindowAura::~DisconnectWindowAura() {
-  ash::WmShell::Get()->system_tray_notifier()->NotifyScreenShareStop();
+  ash::Shell::Get()->system_tray_notifier()->NotifyScreenShareStop();
 }
 
 void DisconnectWindowAura::Start(
@@ -40,7 +40,7 @@ void DisconnectWindowAura::Start(
   // TODO(kelvinp): Clean up the NotifyScreenShareStart interface when we
   // completely retire Hangout Remote Desktop v1.
   base::string16 helper_name;
-  ash::WmShell::Get()->system_tray_notifier()->NotifyScreenShareStart(
+  ash::Shell::Get()->system_tray_notifier()->NotifyScreenShareStart(
       base::Bind(&ClientSessionControl::DisconnectSession,
                  client_session_control, protocol::OK),
       helper_name);