[inspector] fixed all shorten-64-to-32 warnings

src/inspector/v8-runtime-agent-impl.cc

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 346 matching lines @@
   if (!scope.initialize()) {
     callback->sendFailure(errorString);
     return;
   }
 
   std::unique_ptr<v8::Local<v8::Value>[]> argv = nullptr;
   int argc = 0;
   if (optionalArguments.isJust()) {
     protocol::Array<protocol::Runtime::CallArgument>* arguments =
         optionalArguments.fromJust();
-    argc = arguments->length();
+    argc = static_cast<int>(arguments->length());
     argv.reset(new v8::Local<v8::Value>[argc]);
     for (int i = 0; i < argc; ++i) {
       v8::Local<v8::Value> argumentValue;
       if (!scope.injectedScript()
                ->resolveCallArgument(&errorString, arguments->get(i))
                .ToLocal(&argumentValue)) {
         callback->sendFailure(errorString);
         return;
       }
       argv[i] = argumentValue;
@@ skipping 343 matching lines @@
 }
 
 bool V8RuntimeAgentImpl::reportMessage(V8ConsoleMessage* message,
                                        bool generatePreview) {
   message->reportToFrontend(&m_frontend, m_session, generatePreview);
   m_frontend.flush();
   return m_inspector->hasConsoleMessageStorage(m_session->contextGroupId());
 }
 
 }  // namespace v8_inspector