Extract OAuth2AccessTokenFetcher interface.

google_apis/gaia/oauth2_api_call_flow_unittest.cc

Index: google_apis/gaia/oauth2_api_call_flow_unittest.cc
diff --git a/google_apis/gaia/oauth2_api_call_flow_unittest.cc b/google_apis/gaia/oauth2_api_call_flow_unittest.cc
index d56a613eded68003a7b19bc8859aca7349254c3e..29202e847f31ab86cfb3a29e2357f3f8b2b70b91 100644
--- a/google_apis/gaia/oauth2_api_call_flow_unittest.cc
+++ b/google_apis/gaia/oauth2_api_call_flow_unittest.cc
@@ -13,7 +13,7 @@
 #include "google_apis/gaia/gaia_urls.h"
 #include "google_apis/gaia/google_service_auth_error.h"
 #include "google_apis/gaia/oauth2_access_token_consumer.h"
-#include "google_apis/gaia/oauth2_access_token_fetcher.h"
+#include "google_apis/gaia/oauth2_access_token_fetcher_impl.h"
 #include "google_apis/gaia/oauth2_api_call_flow.h"
 #include "net/http/http_request_headers.h"
 #include "net/http/http_status_code.h"
@@ -70,11 +70,11 @@ class MockUrlFetcherFactory : public ScopedURLFetcherFactory,
                    URLFetcherDelegate* d));
 };
 
-class MockAccessTokenFetcher : public OAuth2AccessTokenFetcher {
+class MockAccessTokenFetcher : public OAuth2AccessTokenFetcherImpl {
  public:
   MockAccessTokenFetcher(OAuth2AccessTokenConsumer* consumer,
                          net::URLRequestContextGetter* getter)
-      : OAuth2AccessTokenFetcher(consumer, getter) {}
+      : OAuth2AccessTokenFetcherImpl(consumer, getter) {}
   ~MockAccessTokenFetcher() {}
 
   MOCK_METHOD4(Start,