Only focus the default item in the system tray when spoken feedback is enabled

ash/system/tray/system_tray.cc

Index: ash/system/tray/system_tray.cc
diff --git a/ash/system/tray/system_tray.cc b/ash/system/tray/system_tray.cc
index 4782ec327548940a2036c7806595cfaf7be6446d..65d9ffe3a6d1efb937f2f4d86788a50935c939dd 100644
--- a/ash/system/tray/system_tray.cc
+++ b/ash/system/tray/system_tray.cc
@@ -99,7 +99,12 @@ class SystemBubbleWrapper {
           views::BubbleBorder::PAINT_NONE);
     }
     is_persistent_ = is_persistent;
-    bubble_->FocusDefault();
+
+    // If ChromeVox is enabled, focus the default item.
+    AccessibilityDelegate* delegate =
+        Shell::GetInstance()->accessibility_delegate();
+    if (delegate->IsSpokenFeedbackEnabled())
+      bubble_->FocusDefault();
   }
 
   // Convenience accessors: