Remove ash::ShellDelegate::IsFirstRunAfterBoot method

ash/mus/shell_delegate_mus.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/mus/shell_delegate_mus.h"
 
 #include <utility>
 
 #include "ash/common/gpu_support_stub.h"
 #include "ash/common/media_delegate.h"
@@ skipping 103 matching lines @@
     : connector_(connector), app_list_presenter_(connector) {
   // |connector_| may be null in tests.
 }
 
 ShellDelegateMus::~ShellDelegateMus() {}
 
 service_manager::Connector* ShellDelegateMus::GetShellConnector() const {
   return connector_;
 }
 
-bool ShellDelegateMus::IsFirstRunAfterBoot() const {
-  NOTIMPLEMENTED();
-  return false;
-}
-
 bool ShellDelegateMus::IsIncognitoAllowed() const {
   NOTIMPLEMENTED();
   return false;
 }
 
 bool ShellDelegateMus::IsMultiProfilesEnabled() const {
   NOTIMPLEMENTED();
   return false;
 }
 
@@ skipping 96 matching lines @@
   NOTIMPLEMENTED();
   return base::string16();
 }
 
 gfx::Image ShellDelegateMus::GetDeprecatedAcceleratorImage() const {
   NOTIMPLEMENTED();
   return gfx::Image();
 }
 
 }  // namespace ash