Convert SigninTracker to use OAuth2TokenService notifications

chrome/browser/signin/fake_profile_oauth2_token_service.cc

Index: chrome/browser/signin/fake_profile_oauth2_token_service.cc
diff --git a/chrome/browser/signin/fake_profile_oauth2_token_service.cc b/chrome/browser/signin/fake_profile_oauth2_token_service.cc
index 04d4fb9ef36f9162cae32cee2ed186b73c64a525..6a3c8c35cd4ba8c95dbcab34f89aded700663196 100644
--- a/chrome/browser/signin/fake_profile_oauth2_token_service.cc
+++ b/chrome/browser/signin/fake_profile_oauth2_token_service.cc
@@ -13,7 +13,9 @@ FakeProfileOAuth2TokenService::PendingRequest::~PendingRequest() {
 // static
 BrowserContextKeyedService* FakeProfileOAuth2TokenService::Build(
     content::BrowserContext* profile) {
-  return new FakeProfileOAuth2TokenService();
+  FakeProfileOAuth2TokenService* service = new FakeProfileOAuth2TokenService();
+  service->Initialize(reinterpret_cast<Profile*>(profile));
+  return service;
 }
 
 FakeProfileOAuth2TokenService::FakeProfileOAuth2TokenService() {
@@ -22,11 +24,6 @@ FakeProfileOAuth2TokenService::FakeProfileOAuth2TokenService() {
 FakeProfileOAuth2TokenService::~FakeProfileOAuth2TokenService() {
 }
 
-void FakeProfileOAuth2TokenService::Shutdown() {
-  // Do not call the base class handler because it assumes that Initialize()
-  // is always called before Shutdown() and that's not the case for this mock.
-}
-
 void FakeProfileOAuth2TokenService::IssueRefreshToken(
     const std::string& token) {
   refresh_token_ = token;