[inspector] change implementation file extension from cpp to cc

src/inspector/V8ValueCopier.h

-// Copyright 2016 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_INSPECTOR_V8VALUECOPIER_H_
-#define V8_INSPECTOR_V8VALUECOPIER_H_
-
-#include "include/v8.h"
-
-namespace v8_inspector {
-
-v8::MaybeLocal<v8::Value> copyValueFromDebuggerContext(
-    v8::Isolate*, v8::Local<v8::Context> debuggerContext,
-    v8::Local<v8::Context> toContext, v8::Local<v8::Value>);
-v8::Maybe<bool> createDataProperty(v8::Local<v8::Context>,
-                                   v8::Local<v8::Object>,
-                                   v8::Local<v8::Name> key,
-                                   v8::Local<v8::Value>);
-v8::Maybe<bool> createDataProperty(v8::Local<v8::Context>, v8::Local<v8::Array>,
-                                   int index, v8::Local<v8::Value>);
-
-}  // namespace v8_inspector
-
-#endif  // V8_INSPECTOR_V8VALUECOPIER_H_