Remove the drive status from the ash try.

ash/system/tray/system_tray_delegate.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_delegate.h"
 
 namespace ash {
 
 NetworkIconInfo::NetworkIconInfo()
     : connecting(false),
       connected(false),
       tray_icon_visible(true),
       is_cellular(false) {
 }
 
 NetworkIconInfo::~NetworkIconInfo() {
 }
 
 BluetoothDeviceInfo::BluetoothDeviceInfo()
     : connected(false),
       connecting(false),
       paired(false) {
 }
 
 BluetoothDeviceInfo::~BluetoothDeviceInfo() {
 }
 
-DriveOperationStatus::DriveOperationStatus()
-    : id(-1),
-      progress(0.0),
-      type(OPERATION_DOWNLOAD),
-      state(OPERATION_NOT_STARTED) {
-}
-
-DriveOperationStatus::~DriveOperationStatus() {
-}
-
 IMEInfo::IMEInfo()
     : selected(false),
       third_party(false) {
 }
 
 IMEInfo::~IMEInfo() {
 }
 
 IMEPropertyInfo::IMEPropertyInfo()
     : selected(false) {
 }
 
 IMEPropertyInfo::~IMEPropertyInfo() {
 }
 
 }  // namespace ash