Remove usage of to-be-deprecated APIs from samples

samples/hello-world.cc

 // Copyright 2015 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 <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "include/libplatform/libplatform.h"
 #include "include/v8.h"
@@ skipping 29 matching lines @@
     // Create a stack-allocated handle scope.
     HandleScope handle_scope(isolate);
 
     // Create a new context.
     Local<Context> context = Context::New(isolate);
 
     // Enter the context for compiling and running the hello world script.
     Context::Scope context_scope(context);
 
     // Create a string containing the JavaScript source code.
-    Local<String> source = String::NewFromUtf8(isolate, "'Hello' + ', World!'");
+    Local<String> source =
+        String::NewFromUtf8(isolate, "'Hello' + ', World!'",
+                            NewStringType::kNormal).ToLocalChecked();
 
     // Compile the source code.
-    Local<Script> script = Script::Compile(source);
+    Local<Script> script = Script::Compile(context, source).ToLocalChecked();
 
     // Run the script to get the result.
-    Local<Value> result = script->Run();
+    Local<Value> result = script->Run(context).ToLocalChecked();
 
     // Convert the result to an UTF8 string and print it.
     String::Utf8Value utf8(result);
     printf("%s\n", *utf8);
   }
 
   // Dispose the isolate and tear down V8.
   isolate->Dispose();
   V8::Dispose();
   V8::ShutdownPlatform();
   delete platform;
   return 0;
 }