mash: Migrate AccessibilityDelegate access to WmShell.

chrome/browser/chromeos/accessibility/touch_exploration_controller_browsertest.cc

Index: chrome/browser/chromeos/accessibility/touch_exploration_controller_browsertest.cc
diff --git a/chrome/browser/chromeos/accessibility/touch_exploration_controller_browsertest.cc b/chrome/browser/chromeos/accessibility/touch_exploration_controller_browsertest.cc
index 73757283efbe61c9d6760d722afb7e4dd061ae47..023e522c6401be0a5167ef239eaacf85f4f59202 100644
--- a/chrome/browser/chromeos/accessibility/touch_exploration_controller_browsertest.cc
+++ b/chrome/browser/chromeos/accessibility/touch_exploration_controller_browsertest.cc
@@ -6,6 +6,7 @@
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/accessibility_types.h"
+#include "ash/common/wm_shell.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "base/macros.h"
@@ -58,10 +59,10 @@ class TouchExplorationTest : public InProcessBrowserTest {
   }
 
   void SwitchTouchExplorationMode(bool on) {
-    ash::AccessibilityDelegate* ad =
-        ash::Shell::GetInstance()->accessibility_delegate();
-    if (on != ad->IsSpokenFeedbackEnabled())
-      ad->ToggleSpokenFeedback(ash::A11Y_NOTIFICATION_NONE);
+    ash::AccessibilityDelegate* delegate =
+        ash::WmShell::Get()->GetAccessibilityDelegate();
+    if (on != delegate->IsSpokenFeedbackEnabled())
+      delegate->ToggleSpokenFeedback(ash::A11Y_NOTIFICATION_NONE);
   }
 
   base::TimeTicks Now() { return simulated_clock_->NowTicks(); }