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

ash/system/tray/system_tray.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/system/tray/system_tray.h"
 
 #include "ash/ash_switches.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shell.h"
 #include "ash/shell/panel_window.h"
@@ skipping 81 matching lines @@
         Shell::GetInstance()->system_tray_delegate()->GetUserLoginStatus();
     bubble_->InitView(anchor, login_status, init_params);
     bubble_wrapper_.reset(
         new internal::TrayBubbleWrapper(tray, bubble_->bubble_view()));
     if (ash::switches::UseAlternateShelfLayout()) {
       // The system bubble should not have an arrow.
       bubble_->bubble_view()->SetArrowPaintType(
           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:
   SystemTrayBubble* bubble() const { return bubble_.get(); }
   SystemTrayBubble::BubbleType bubble_type() const {
     return bubble_->bubble_type();
   }
   TrayBubbleView* bubble_view() const { return bubble_->bubble_view(); }
   bool is_persistent() const { return is_persistent_; }
 
@@ skipping 592 matching lines @@
   system_bubble_.reset();
   // When closing a system bubble with the alternate shelf layout, we need to
   // turn off the active tinting of the shelf.
   if (full_system_tray_menu_) {
     SetDrawBackgroundAsActive(false);
     full_system_tray_menu_ = false;
   }
 }
 
 }  // namespace ash