Refactor AO2TS to make it easier to componentize.

google_apis/gaia/fake_oauth2_token_service.cc

Index: google_apis/gaia/fake_oauth2_token_service.cc
diff --git a/google_apis/gaia/fake_oauth2_token_service.cc b/google_apis/gaia/fake_oauth2_token_service.cc
index adff32d321986d259f5ca8e6a361dcc80bf5a134..f425e789ff8d9b24c847b94a434f94d4f11cf4b0 100644
--- a/google_apis/gaia/fake_oauth2_token_service.cc
+++ b/google_apis/gaia/fake_oauth2_token_service.cc
@@ -10,7 +10,8 @@ FakeOAuth2TokenService::PendingRequest::PendingRequest() {
 FakeOAuth2TokenService::PendingRequest::~PendingRequest() {
 }
 
-FakeOAuth2TokenService::FakeOAuth2TokenService() : request_context_(NULL) {
+FakeOAuth2TokenService::FakeOAuth2TokenService() : OAuth2TokenService(NULL) {
+  request_context_ = nullptr;
 }
 
 FakeOAuth2TokenService::~FakeOAuth2TokenService() {
@@ -54,12 +55,12 @@ bool FakeOAuth2TokenService::RefreshTokenIsAvailable(
 
 void FakeOAuth2TokenService::AddAccount(const std::string& account_id) {
   account_ids_.insert(account_id);
-  FireRefreshTokenAvailable(account_id);
+  // FireRefreshTokenAvailable(account_id);
 }
 
 void FakeOAuth2TokenService::RemoveAccount(const std::string& account_id) {
   account_ids_.erase(account_id);
-  FireRefreshTokenRevoked(account_id);
+  // FireRefreshTokenRevoked(account_id);

[Roger Tawa OOO till Jul 10th, 2015/05/24 21:13:18]

We need a FakeOAuth2TokenServiceDelegate.  I think once this is done it will be
easier to implement these functions.

[gogerald1, 2015/05/25 21:10:57]

Acknowledged. Definitely

 }
 
 void FakeOAuth2TokenService::IssueAllTokensForAccount(