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

src/assert-scope.h

 // Copyright 2013 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_ASSERT_SCOPE_H_
 #define V8_ASSERT_SCOPE_H_
 
-#include "include/v8stdint.h"
+#include <stdint.h>
 #include "src/base/macros.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class Isolate;
 class PerThreadAssertData;
 
 
@@ skipping 156 matching lines @@
 // Scope to document where we do not expect deoptimization.
 typedef PerIsolateAssertScopeDebugOnly<COMPILATION_ASSERT, false>
     DisallowCompilation;
 
 // Scope to introduce an exception to DisallowDeoptimization.
 typedef PerIsolateAssertScopeDebugOnly<COMPILATION_ASSERT, true>
     AllowCompilation;
 } }  // namespace v8::internal
 
 #endif  // V8_ASSERT_SCOPE_H_