Build a new TokenCacheService so I can stop using TokenService for something it wasn't designed for.

chrome/browser/signin/token_service.h

Index: chrome/browser/signin/token_service.h
diff --git a/chrome/browser/signin/token_service.h b/chrome/browser/signin/token_service.h
index 91b5910ae2b0f7c69b06d2041c7a164b567f0a78..87eddc03491affddc07b33a837a47b8780dd68a4 100644
--- a/chrome/browser/signin/token_service.h
+++ b/chrome/browser/signin/token_service.h
@@ -116,10 +116,6 @@ class TokenService : public GaiaAuthConsumer,
   // Used to determine whether Initialize() has been called.
   bool Initialized() const { return !source_.empty(); }
 
-  // Add a token not supported by a fetcher.
-  void AddAuthTokenManually(const std::string& service,
-                            const std::string& auth_token);
-
   // Update ClientLogin credentials in the token service.
   // Afterwards you can StartFetchingTokens.
   void UpdateCredentials(