Remove tuple-related includes and comments in Functional.h

third_party/WebKit/Source/wtf/Functional.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 10 matching lines @@
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WTF_Functional_h
 #define WTF_Functional_h
 
 #include "base/bind.h"
 #include "base/threading/thread_checker.h"
-#include "base/tuple.h"
 #include "wtf/Allocator.h"
 #include "wtf/Assertions.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/RefPtr.h"
 #include "wtf/ThreadSafeRefCounted.h"
 #include "wtf/TypeTraits.h"
 #include "wtf/WeakPtr.h"
-#include <tuple>
 #include <utility>
 
 namespace blink {
 template <typename T> class Member;
 template <typename T> class WeakMember;
 }
 
 namespace base {
 
 template <typename T>
@@ skipping 190 matching lines @@
         threadAffinity == SameThreadAffinity,
         base::ThreadChecker,
         base::ThreadCheckerDoNothing>::type;
     MaybeThreadChecker m_threadChecker;
     base::Callback<R(Args...)> m_callback;
 };
 
 template <FunctionThreadAffinity threadAffinity, typename FunctionType, typename... BoundParameters>
 std::unique_ptr<Function<base::MakeUnboundRunType<FunctionType, BoundParameters...>, threadAffinity>> bindInternal(FunctionType function, BoundParameters&&... boundParameters)
 {
-    // Bound parameters' types are wrapped with std::tuple so we can pass two template parameter packs (bound
-    // parameters and unbound) to PartBoundFunctionImpl. Note that a tuple of this type isn't actually created;
-    // std::tuple<> is just for carrying the bound parameters' types. Any other class template taking a type parameter
-    // pack can be used instead of std::tuple. std::tuple is used just because it's most convenient for this purpose.
     using UnboundRunType = base::MakeUnboundRunType<FunctionType, BoundParameters...>;
     return wrapUnique(new Function<UnboundRunType, threadAffinity>(base::Bind(function, typename ParamStorageTraits<typename std::decay<BoundParameters>::type>::StorageType(std::forward<BoundParameters>(boundParameters))...)));
 }
 
 template <typename FunctionType, typename... BoundParameters>
 std::unique_ptr<Function<base::MakeUnboundRunType<FunctionType, BoundParameters...>, SameThreadAffinity>> bind(FunctionType function, BoundParameters&&... boundParameters)
 {
     return bindInternal<SameThreadAffinity>(function, std::forward<BoundParameters>(boundParameters)...);
 }
 
 typedef Function<void(), SameThreadAffinity> Closure;
 typedef Function<void(), CrossThreadAffinity> CrossThreadClosure;
 
 } // namespace WTF
 
 using WTF::passed;
 using WTF::unretained;
 using WTF::crossThreadUnretained;
 
 using WTF::Function;
 using WTF::CrossThreadClosure;
 
 #endif // WTF_Functional_h