[inspector] fix integer conversion

test/inspector/inspector-impl.cc

 // 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.
 
 #include "test/inspector/inspector-impl.h"
 
 #include "include/v8.h"
 #include "src/inspector/string-16.h"
 
 namespace {
@@ skipping 37 matching lines @@
 
 void MessageHandler(v8::Local<v8::Message> message,
                     v8::Local<v8::Value> exception) {
   v8::Isolate* isolate = v8::Isolate::GetCurrent();
   v8::Local<v8::Context> context = isolate->GetEnteredContext();
   if (context.IsEmpty()) return;
   v8_inspector::V8Inspector* inspector =
       InspectorClientImpl::InspectorFromContext(context);
 
   v8::Local<v8::StackTrace> stack = message->GetStackTrace();
-  int script_id = message->GetScriptOrigin().ScriptID()->Value();
+  int script_id =
+      static_cast<int>(message->GetScriptOrigin().ScriptID()->Value());
   if (!stack.IsEmpty() && stack->GetFrameCount() > 0) {
     int top_script_id = stack->GetFrame(0)->GetScriptId();
     if (top_script_id == script_id) script_id = 0;
   }
   int line_number = message->GetLineNumber(context).FromMaybe(0);
   int column_number = 0;
   if (message->GetStartColumn(context).IsJust())
     column_number = message->GetStartColumn(context).FromJust() + 1;
 
   v8_inspector::StringView detailed_message;
@@ skipping 123 matching lines @@
 }
 
 void SendMessageToBackendExtension::SendMessageToBackend(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   CHECK(backend_task_runner_);
   CHECK(args.Length() == 1 && args[0]->IsString());
   v8::Local<v8::String> message = args[0].As<v8::String>();
   backend_task_runner_->Append(
       new SendMessageToBackendTask(ToString16(message)));
 }