[DevTools] Switch from platform/v8_inspector to v8/v8-inspector.h.

third_party/WebKit/Source/platform/v8_inspector/Allocator.h

-// Copyright 2016 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.
-
-#ifndef Allocator_h
-#define Allocator_h
-
-#include <cstddef>
-#include <cstdint>
-
-enum NotNullTagEnum { NotNullLiteral };
-
-#define V8_INSPECTOR_DISALLOW_NEW()                             \
-    private:                                                    \
-        void* operator new(size_t) = delete;                    \
-        void* operator new(size_t, NotNullTagEnum, void*) = delete; \
-        void* operator new(size_t, void*) = delete;             \
-    public:
-
-#define V8_INSPECTOR_DISALLOW_COPY(ClassName) \
-    private: \
-        ClassName(const ClassName&) = delete; \
-        ClassName& operator=(const ClassName&) = delete
-
-// Macro that returns a compile time constant with the length of an array, but gives an error if passed a non-array.
-template<typename T, std::size_t Size> char (&ArrayLengthHelperFunction(T (&)[Size]))[Size];
-// GCC needs some help to deduce a 0 length array.
-#if defined(__GNUC__)
-template<typename T> char (&ArrayLengthHelperFunction(T (&)[0]))[0];
-#endif
-#define V8_INSPECTOR_ARRAY_LENGTH(array) sizeof(::ArrayLengthHelperFunction(array))
-
-#endif // !defined(Allocator_h)