Extract OAuth2AccessTokenFetcher interface.

google_apis/gaia/oauth2_token_service.cc

Index: google_apis/gaia/oauth2_token_service.cc
diff --git a/google_apis/gaia/oauth2_token_service.cc b/google_apis/gaia/oauth2_token_service.cc
index 5f59d04ff86725603677c536f64d3cd79e703e8d..d359d3ede9c594a2d6b0cbf6e7fd851540c66ba0 100644
--- a/google_apis/gaia/oauth2_token_service.cc
+++ b/google_apis/gaia/oauth2_token_service.cc
@@ -246,11 +246,12 @@ OAuth2TokenService::Fetcher::~Fetcher() {
 }
 
 void OAuth2TokenService::Fetcher::Start() {
-  fetcher_.reset(new OAuth2AccessTokenFetcher(this, getter_.get()));
+  fetcher_.reset(new OAuth2AccessTokenFetcherImpl(getter_.get()));
   fetcher_->Start(client_id_,
                   client_secret_,
                   refresh_token_,
-                  std::vector<std::string>(scopes_.begin(), scopes_.end()));
+                  std::vector<std::string>(scopes_.begin(), scopes_.end()),
+                  this);

[Roger Tawa OOO till Jul 10th, 2014/03/03 21:24:44]

Maybe define a virtual CreateAccessTokenFetcher() method so that you can
override for iOS without forking?

[msarda, 2014/03/04 12:37:13]

I plan to do that in a separate CL. Just to separate the concerns.

   retry_timer_.Stop();
 }