Move AccessibilityDelegate ownership to ash::WmShell

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 e7743ffba4540821e8864da1284e9caf2352287e..99b9d9272dda1cf8bad23f92eb38147811a4b0ea 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -484,7 +484,7 @@ bool CanHandleToggleAppList(const ui::Accelerator& accelerator,
     // When spoken feedback is enabled, we should neither toggle the list nor
     // consume the key since Search+Shift is one of the shortcuts the a11y
     // feature uses. crbug.com/132296
-    if (WmShell::Get()->GetAccessibilityDelegate()->IsSpokenFeedbackEnabled())
+    if (WmShell::Get()->accessibility_delegate()->IsSpokenFeedbackEnabled())
       return false;
   }
   return true;
@@ -666,7 +666,7 @@ void HandleToggleMirrorMode() {
 void HandleToggleSpokenFeedback() {
   base::RecordAction(UserMetricsAction("Accel_Toggle_Spoken_Feedback"));
 
-  WmShell::Get()->GetAccessibilityDelegate()->ToggleSpokenFeedback(
+  WmShell::Get()->accessibility_delegate()->ToggleSpokenFeedback(
       A11Y_NOTIFICATION_SHOW);
 }
 
@@ -1407,7 +1407,7 @@ AcceleratorController::GetAcceleratorProcessingRestriction(int action) {
   }
   if (wm_shell->mru_window_tracker()->BuildMruWindowList().empty() &&
       actions_needing_window_.find(action) != actions_needing_window_.end()) {
-    wm_shell->GetAccessibilityDelegate()->TriggerAccessibilityAlert(
+    wm_shell->accessibility_delegate()->TriggerAccessibilityAlert(
         A11Y_ALERT_WINDOW_NEEDED);
     return RESTRICTION_PREVENT_PROCESSING_AND_PROPAGATION;
   }