Fixes for -Wunused-function on Linux, Android and ChromeOS

chrome/browser/ui/app_list/chrome_signin_delegate.cc

 // 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.
 
 #include "chrome/browser/ui/app_list/chrome_signin_delegate.h"
 
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/signin_manager.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/browser/signin/signin_promo.h"
 #include "chrome/browser/ui/browser_navigator.h"
 #include "chrome/browser/ui/chrome_pages.h"
 #include "chrome/browser/ui/extensions/application_launch.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "chrome/browser/ui/scoped_tabbed_browser_displayer.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "content/public/common/page_transition_types.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 
 namespace {
 
+#if !defined(OS_CHROMEOS)
 SigninManagerBase* GetSigninManager(Profile* profile) {
   return SigninManagerFactory::GetForProfile(profile);
 }
+#endif  // !defined(OS_CHROMEOS)
 
 }  // namespace
 
 ChromeSigninDelegate::ChromeSigninDelegate() {}
 
 ChromeSigninDelegate::~ChromeSigninDelegate() {}
 
 void ChromeSigninDelegate::SetProfile(Profile* profile) {
   profile_ = profile;
 }
@@ skipping 54 matching lines @@
 
 string16 ChromeSigninDelegate::GetLearnMoreLinkText() {
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
   return rb.GetLocalizedString(IDS_APP_LIST_SIGNIN_LEARN_MORE_TEXT);
 }
 
 string16 ChromeSigninDelegate::GetSettingsLinkText() {
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
   return rb.GetLocalizedString(IDS_APP_LIST_SIGNIN_SETTINGS_TEXT);
 }