Remove unnecessary HelperResultType trait.

third_party/WebKit/Source/modules/filesystem/SyncCallbackHelper.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 29 matching lines @@
 #include "modules/filesystem/EntryCallback.h"
 #include "modules/filesystem/EntrySync.h"
 #include "modules/filesystem/ErrorCallback.h"
 #include "modules/filesystem/FileEntry.h"
 #include "modules/filesystem/FileSystemCallback.h"
 #include "modules/filesystem/MetadataCallback.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
-template <typename ResultType, typename CallbackArg>
-struct HelperResultType {
-    DISALLOW_NEW();
-public:
-    typedef ResultType* ReturnType;
-    typedef Member<ResultType> StorageType;
-
-    static ReturnType createFromCallbackArg(CallbackArg argument)
-    {
-        return ResultType::create(argument);
-    }
-};
-
 // A helper template for FileSystemSync implementation.
 template <typename SuccessCallback, typename CallbackArg, typename ResultType>
 class SyncCallbackHelper final : public GarbageCollected<SyncCallbackHelper<SuccessCallback, CallbackArg, ResultType>> {
 public:
     typedef SyncCallbackHelper<SuccessCallback, CallbackArg, ResultType> HelperType;
-    typedef HelperResultType<ResultType, CallbackArg> ResultTypeTrait;
-    typedef typename ResultTypeTrait::StorageType ResultStorageType;
-    typedef typename ResultTypeTrait::ReturnType ResultReturnType;
 
     static HelperType* create()
     {
         return new SyncCallbackHelper();
     }
 
-    ResultReturnType getResult(ExceptionState& exceptionState)
+    ResultType* getResult(ExceptionState& exceptionState)
     {
         if (m_errorCode)
             FileError::throwDOMException(exceptionState, m_errorCode);
 
         return m_result;
     }
 
     SuccessCallback* getSuccessCallback() { return SuccessCallbackImpl::create(this); }
     ErrorCallback* getErrorCallback() { return ErrorCallbackImpl::create(this); }
 
@@ skipping 68 matching lines @@
     };
 
     void setError(FileError::ErrorCode code)
     {
         m_errorCode = code;
         m_completed = true;
     }
 
     void setResult(CallbackArg result)
     {
-        m_result = ResultTypeTrait::createFromCallbackArg(result);
+        m_result = ResultType::create(result);
         m_completed = true;
     }
 
-    ResultStorageType m_result;
+    Member<ResultType> m_result;
     FileError::ErrorCode m_errorCode;
     bool m_completed;
 };
 
 struct EmptyType : public GarbageCollected<EmptyType> {
     static EmptyType* create(EmptyType*)
     {
         return 0;
     }
 
     DEFINE_INLINE_TRACE() { }
 };
 
 typedef SyncCallbackHelper<EntryCallback, Entry*, EntrySync> EntrySyncCallbackHelper;
 typedef SyncCallbackHelper<MetadataCallback, Metadata*, Metadata> MetadataSyncCallbackHelper;
 typedef SyncCallbackHelper<VoidCallback, EmptyType*, EmptyType> VoidSyncCallbackHelper;
 typedef SyncCallbackHelper<FileSystemCallback, DOMFileSystem*, DOMFileSystemSync> FileSystemSyncCallbackHelper;
 
 } // namespace blink
 
 #endif // SyncCallbackHelper_h