Cleanup: Fix base header include guards.

base/tuple.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A Tuple is a generic templatized container, similar in concept to std::pair
 // and std::tuple.  The convenient MakeTuple() function takes any number of
 // arguments and will construct and return the appropriate Tuple object.  The
 // functions DispatchToMethod and DispatchToFunction take a function pointer or
 // instance and method pointer, and unpack a tuple into arguments to the call.
 //
 // Tuple elements are copied by value, and stored in the tuple.  See the unit
 // tests for more details of how/when the values are copied.
 //
 // Example usage:
 //   // These two methods of creating a Tuple are identical.
 //   Tuple<int, const char*> tuple_a(1, "wee");
 //   Tuple<int, const char*> tuple_b = MakeTuple(1, "wee");
 //
 //   void SomeFunc(int a, const char* b) { }
 //   DispatchToFunction(&SomeFunc, tuple_a);  // SomeFunc(1, "wee")
 //   DispatchToFunction(
 //       &SomeFunc, MakeTuple(10, "foo"));    // SomeFunc(10, "foo")
 //
 //   struct { void SomeMeth(int a, int b, int c) { } } foo;
 //   DispatchToMethod(&foo, &Foo::SomeMeth, MakeTuple(1, 2, 3));
 //   // foo->SomeMeth(1, 2, 3);
 
-#ifndef BASE_TUPLE_H__
-#define BASE_TUPLE_H__
+#ifndef BASE_TUPLE_H_
+#define BASE_TUPLE_H_
 
 #include "base/bind_helpers.h"
 
 // Index sequences
 //
 // Minimal clone of the similarly-named C++14 functionality.
 
 template <size_t...>
 struct IndexSequence {};
 
@@ skipping 282 matching lines @@
 template <typename ObjT, typename Method, typename... InTs, typename... OutTs>
 inline void DispatchToMethod(ObjT* obj,
                              Method method,
                              const Tuple<InTs...>& in,
                              Tuple<OutTs...>* out) {
   DispatchToMethodImpl(obj, method, in, out,
                        MakeIndexSequence<sizeof...(InTs)>(),
                        MakeIndexSequence<sizeof...(OutTs)>());
 }
 
-#endif  // BASE_TUPLE_H__
+#endif  // BASE_TUPLE_H_