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

src/base/bits.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_BITS_H_
 #define V8_BASE_BITS_H_
 
-#include "include/v8stdint.h"
+#include <stdint.h>
 #include "src/base/macros.h"
 #if V8_CC_MSVC
 #include <intrin.h>
 #endif
 #if V8_OS_WIN32
 #include "src/base/win32-headers.h"
 #endif
 
 namespace v8 {
 namespace base {
@@ skipping 178 matching lines @@
 // SignedMulHighAndAdd32(lhs, rhs, acc) multiplies two signed 32-bit values
 // |lhs| and |rhs|, extracts the most significant 32 bits of the result, and
 // adds the accumulate value |acc|.
 int32_t SignedMulHighAndAdd32(int32_t lhs, int32_t rhs, int32_t acc);
 
 }  // namespace bits
 }  // namespace base
 }  // namespace v8
 
 #endif  // V8_BASE_BITS_H_