Remove BrowserSignin, as it's not used anywhere.

chrome/browser/profiles/profile_impl.cc

 // Copyright (c) 2011 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/profiles/profile_impl.h"
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/environment.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "chrome/browser/autocomplete/autocomplete_classifier.h"
 #include "chrome/browser/autofill/personal_data_manager.h"
 #include "chrome/browser/background/background_contents_service_factory.h"
 #include "chrome/browser/background/background_mode_manager.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/browser_process.h"
-#include "chrome/browser/browser_signin.h"
 #include "chrome/browser/browsing_data_remover.h"
 #include "chrome/browser/content_settings/host_content_settings_map.h"
 #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/download/chrome_download_manager_delegate.h"
 #include "chrome/browser/extensions/extension_devtools_manager.h"
 #include "chrome/browser/extensions/extension_error_reporter.h"
 #include "chrome/browser/extensions/extension_event_router.h"
 #include "chrome/browser/extensions/extension_info_map.h"
 #include "chrome/browser/extensions/extension_message_service.h"
@@ skipping 1503 matching lines @@
 ProfileSyncService* ProfileImpl::GetProfileSyncService(
     const std::string& cros_user) {
 
   if (!ProfileSyncService::IsSyncEnabled())
     return NULL;
   if (!sync_service_.get())
     InitSyncService(cros_user);
   return sync_service_.get();
 }
 
-BrowserSignin* ProfileImpl::GetBrowserSignin() {
-  if (!browser_signin_.get()) {
-    browser_signin_.reset(new BrowserSignin(this));
-  }
-  return browser_signin_.get();
-}
-
 void ProfileImpl::InitSyncService(const std::string& cros_user) {
   profile_sync_factory_.reset(
       new ProfileSyncFactoryImpl(this, CommandLine::ForCurrentProcess()));
   sync_service_.reset(
       profile_sync_factory_->CreateProfileSyncService(cros_user));
   profile_sync_factory_->RegisterDataTypes(sync_service_.get());
   sync_service_->Initialize();
 }
 
 ChromeBlobStorageContext* ProfileImpl::GetBlobStorageContext() {
@@ skipping 159 matching lines @@
 #endif
   }
   return prerender_manager_.get();
 }
 
 SpellCheckProfile* ProfileImpl::GetSpellCheckProfile() {
   if (!spellcheck_profile_.get())
     spellcheck_profile_.reset(new SpellCheckProfile());
   return spellcheck_profile_.get();
 }