Remove v8stdint.h, it doesn't serve a purpose anymore.

src/base/functional.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_BASE_FUNCTIONAL_H_
 #define V8_BASE_FUNCTIONAL_H_
 
+#include <stddef.h>
+#include <stdint.h>
+
 #include <cstddef>
 #include <cstring>
 #include <functional>
 #include <utility>
 
-#include "include/v8stdint.h"
 #include "src/base/macros.h"
 
 namespace v8 {
 namespace base {
 
 // base::hash is an implementation of the hash function object specified by
 // C++11. It was designed to be compatible with std::hash (in C++11) and
 // boost:hash (which in turn is based on the hash function object specified by
 // the Draft Technical Report on C++ Library Extensions (TR1)).
 //
@@ skipping 192 matching lines @@
     }                                                                         \
   };
 V8_BASE_BIT_SPECIALIZE_BIT_CAST(float, uint32_t)
 V8_BASE_BIT_SPECIALIZE_BIT_CAST(double, uint64_t)
 #undef V8_BASE_BIT_SPECIALIZE_BIT_CAST
 
 }  // namespace base
 }  // namespace v8
 
 #endif  // V8_BASE_FUNCTIONAL_H_