Do not activate system tray bubble by default

ash/accelerators/accelerator_controller_delegate_aura.cc

 // Copyright 2016 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/accelerators/accelerator_controller_delegate_aura.h"
 
 #include <algorithm>
 #include <cmath>
 #include <string>
 #include <utility>
@@ skipping 179 matching lines @@
     active_window->layer()->GetAnimator()->StartAnimation(
         new ui::LayerAnimationSequence(
             new WindowRotation(360, active_window->layer())));
   }
 }
 
 void HandleShowSystemTrayBubble() {
   base::RecordAction(UserMetricsAction("Accel_Show_System_Tray_Bubble"));
   RootWindowController* controller =
       RootWindowController::ForTargetRootWindow();
-  if (!controller->GetSystemTray()->HasSystemBubble())
-    controller->GetSystemTray()->ShowDefaultView(BUBBLE_CREATE_NEW);
+  SystemTray* tray = controller->GetSystemTray();
+  if (!tray->HasSystemBubble()) {
+    tray->ShowDefaultView(BUBBLE_CREATE_NEW);
+    tray->ActivateBubble();
+  }
 }
 
 void HandleTakeWindowScreenshot(ScreenshotDelegate* screenshot_delegate) {
   base::RecordAction(UserMetricsAction("Accel_Take_Window_Screenshot"));
   DCHECK(screenshot_delegate);
   Shell::GetInstance()->screenshot_controller()->StartWindowScreenshotSession(
       screenshot_delegate);
 }
 
 void HandleTakePartialScreenshot(ScreenshotDelegate* screenshot_delegate) {
@@ skipping 287 matching lines @@
           message_center::NotifierId(
               message_center::NotifierId::SYSTEM_COMPONENT,
               system_notifier::kNotifierDeprecatedAccelerator),
           message_center::RichNotificationData(),
           new DeprecatedAcceleratorNotificationDelegate));
   message_center::MessageCenter::Get()->AddNotification(
       std::move(notification));
 }
 
 }  // namespace ash