google_apis: Random fix in task_util.h

chrome/browser/google_apis/task_util.h

Index: chrome/browser/google_apis/task_util.h
diff --git a/chrome/browser/google_apis/task_util.h b/chrome/browser/google_apis/task_util.h
index d186f3d8c0e9517b4990750da9b721f09bca2814..883a0e84655b1c53f250fb767d063792f992ee39 100644
--- a/chrome/browser/google_apis/task_util.h
+++ b/chrome/browser/google_apis/task_util.h
@@ -10,8 +10,8 @@
 
 namespace google_apis {
 
-// Runs task on the thread to which |relay_proxy| belongs.
-void RunTaskOnThread(scoped_refptr<base::MessageLoopProxy> relay_proxy,
+// Runs task on the thread to which |task_runner| belongs.
+void RunTaskOnThread(scoped_refptr<base::SingleThreadTaskRunner> task_runner,
                      const base::Closure& task);
 
 namespace internal {
@@ -106,33 +106,6 @@ struct ComposedCallback<void(T1, scoped_ptr<T2, D2>, T3, T4)> {
   }
 };
 
-// GetDefaultValue returns a value constructed by the default constructor.
-template<typename T> struct DefaultValueCreator {
-  static T GetDefaultValue() { return T(); }
-};
-template<typename T> struct DefaultValueCreator<const T&> {
-  static T GetDefaultValue() { return T(); }
-};
-
-// Helper of CreateErrorRunCallback implementation.
-// Provides:
-// - ResultType; the type of the Callback which should be returned by
-//     CreateErrorRunCallback.
-// - Run(): a static function which takes the original |callback| and |error|,
-//     and runs the |callback|.Run() with the error code and default values
-//     for remaining arguments.
-template<typename CallbackType> struct CreateErrorRunCallbackHelper;
-
-// CreateErrorRunCallback with two arguments.
-template<typename ErrorType, typename P1>
-struct CreateErrorRunCallbackHelper<void(ErrorType, P1)> {
-  typedef base::Callback<void(ErrorType)> ResultType;
-  static void Run(
-      const base::Callback<void(ErrorType, P1)>& callback, ErrorType error) {
-    callback.Run(error, DefaultValueCreator<P1>::GetDefaultValue());
-  }
-};
-
 }  // namespace internal
 
 // Returns callback that takes arguments (arg1, arg2, ...), create a closure
@@ -158,15 +131,6 @@ CallbackType CreateRelayCallback(const CallbackType& callback) {
       callback);
 }
 
-// Returns a callback with the tail parameter bound to its default value.
-// In other words, returned_callback.Run(error) runs callback.Run(error, T()).
-template<typename CallbackType>
-typename internal::CreateErrorRunCallbackHelper<CallbackType>::ResultType
-CreateErrorRunCallback(const base::Callback<CallbackType>& callback) {
-  return base::Bind(
-      &internal::CreateErrorRunCallbackHelper<CallbackType>::Run, callback);
-}
-
 }  // namespace google_apis
 
 #endif  // CHROME_BROWSER_GOOGLE_APIS_TASK_UTIL_H_