Fix MediaClient::RequestCaptureState().

ash/common/system/chromeos/media_security/multi_profile_media_tray_item.cc

Index: ash/common/system/chromeos/media_security/multi_profile_media_tray_item.cc
diff --git a/ash/common/system/chromeos/media_security/multi_profile_media_tray_item.cc b/ash/common/system/chromeos/media_security/multi_profile_media_tray_item.cc
index 9c0bdf6d84c4e62f50e52582b2eb626b8cfcd9ed..5864e2f5c1a30e6288a1181a701f8673eb1f68bb 100644
--- a/ash/common/system/chromeos/media_security/multi_profile_media_tray_item.cc
+++ b/ash/common/system/chromeos/media_security/multi_profile_media_tray_item.cc
@@ -6,7 +6,7 @@
 
 #include "ash/common/ash_view_ids.h"
 #include "ash/common/media_controller.h"
-#include "ash/common/session/session_state_delegate.h"
+#include "ash/common/session/session_controller.h"
 #include "ash/common/system/tray/system_tray_notifier.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_item_view.h"
@@ -44,11 +44,10 @@ class MultiProfileMediaTrayView : public TrayItemView,
   // MediaCaptureObserver:
   void OnMediaCaptureChanged(
       const std::vector<mojom::MediaCaptureState>& capture_states) override {
-    SessionStateDelegate* session_state_delegate =
-        WmShell::Get()->GetSessionStateDelegate();
     // The user at 0 is the current desktop user.
     for (UserIndex index = 1;
-         index < session_state_delegate->NumberOfLoggedInUsers(); ++index) {
+         index < WmShell::Get()->session_controller()->NumberOfLoggedInUsers();

[James Cook, 2017/01/09 21:07:19]

xiyuan, this works, but is the long-term plan that session-related stuff in ash
goes through SessionController, or is the plan that ash has its own instance of
UserManager?

[xiyuan, 2017/01/09 21:21:47]

yes, ash code should use SessionController. The browser side code uses
UserManager/SessionManager since those two are part of the browser process ATM.
UserManager/SessionManager might move to their own process in the future but I
don't think we want to move them into ash.

+         ++index) {
       if (capture_states[index] != mojom::MediaCaptureState::NONE) {
         SetVisible(true);
         return;