Unify and change logout/sleep/lock shortcuts

ash/accelerators/accelerator_controller.cc

Index: ash/accelerators/accelerator_controller.cc
diff --git a/ash/accelerators/accelerator_controller.cc b/ash/accelerators/accelerator_controller.cc
index 43e2dac547950e5c85a02a14175b7ff9758854af..e785f64de1d30578471e1d7fa1e1eeac4640cae1 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -376,6 +376,7 @@ AcceleratorController::~AcceleratorController() {
 }
 
 void AcceleratorController::Init() {
+  exit_warning_handler_.Init(context());
   for (size_t i = 0; i < kActionsAllowedAtLoginOrLockScreenLength; ++i) {
     actions_allowed_at_login_screen_.insert(
         kActionsAllowedAtLoginOrLockScreen[i]);
@@ -577,9 +578,8 @@ bool AcceleratorController::PerformAction(int action,
     case OPEN_FEEDBACK_PAGE:
       ash::Shell::GetInstance()->delegate()->OpenFeedbackPage();
       return true;
-    case EXIT_PRESSED:
-    case EXIT_RELEASED:
-      exit_warning_handler_.HandleExitKey(action == EXIT_PRESSED);
+    case EXIT:
+      exit_warning_handler_.HandleAccelerator();
       return true;
     case NEW_INCOGNITO_WINDOW:
       Shell::GetInstance()->delegate()->NewWindow(true /* is_incognito */);