google_apis: Move AuthOperation to auth_service.cc

chrome/browser/google_apis/auth_service.h

Index: chrome/browser/google_apis/auth_service.h
diff --git a/chrome/browser/google_apis/auth_service.h b/chrome/browser/google_apis/auth_service.h
index ea363cc091f2c619ebf3b51e395235a9e45861ac..35f8d226693305e089f6527deffd465d5b8dfba4 100644
--- a/chrome/browser/google_apis/auth_service.h
+++ b/chrome/browser/google_apis/auth_service.h
@@ -22,6 +22,10 @@ namespace google_apis {
 class OperationRegistry;
 class AuthServiceObserver;
 
+// Callback type for authentication related DriveServiceInterface calls.
+typedef base::Callback<void(GDataErrorCode error,
+                            const std::string& token)> AuthStatusCallback;
+
 // This class provides authentication for Google services.
 // It integrates specific service integration with OAuth2 stack
 // (TokenService) and provides OAuth2 token refresh infrastructure.