chromeos: Move ownership of system tray width from chrome to ash

chrome/browser/ui/ash/system_tray_delegate_chromeos.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_DELEGATE_CHROMEOS_H_
 #define CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_DELEGATE_CHROMEOS_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 96 matching lines @@
   void ManageBluetoothDevices() override;
   void ToggleBluetooth() override;
   void ShowOtherNetworkDialog(const std::string& type) override;
   bool GetBluetoothAvailable() override;
   bool GetBluetoothEnabled() override;
   bool GetBluetoothDiscovering() override;
   ash::CastConfigDelegate* GetCastConfigDelegate() override;
   ash::NetworkingConfigDelegate* GetNetworkingConfigDelegate() const override;
   bool GetSessionStartTime(base::TimeTicks* session_start_time) override;
   bool GetSessionLengthLimit(base::TimeDelta* session_length_limit) override;
-  int GetSystemTrayMenuWidth() override;
   void ActiveUserWasChanged() override;
   bool IsSearchKeyMappedToCapsLock() override;
   void AddCustodianInfoTrayObserver(
       ash::CustodianInfoTrayObserver* observer) override;
   void RemoveCustodianInfoTrayObserver(
       ash::CustodianInfoTrayObserver* observer) override;
   void AddShutdownPolicyObserver(
       ash::ShutdownPolicyObserver* observer) override;
   void RemoveShutdownPolicyObserver(
       ash::ShutdownPolicyObserver* observer) override;
@@ skipping 153 matching lines @@
 
   base::WeakPtrFactory<SystemTrayDelegateChromeOS> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayDelegateChromeOS);
 };
 
 ash::SystemTrayDelegate* CreateSystemTrayDelegate();
 
 }  // namespace chromeos
 #endif  // CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_DELEGATE_CHROMEOS_H_