Remove usage of to-be-deprecated APIs from v8 core

src/extensions/externalize-string-extension.cc

Index: src/extensions/externalize-string-extension.cc
diff --git a/src/extensions/externalize-string-extension.cc b/src/extensions/externalize-string-extension.cc
index e45cb67efa899dd2cf0661dc96bcbb8eb9548793..e2213b0bd4b65c2455e8d86a8b911a06eece49d4 100644
--- a/src/extensions/externalize-string-extension.cc
+++ b/src/extensions/externalize-string-extension.cc
@@ -54,28 +54,36 @@ ExternalizeStringExtension::GetNativeFunctionTemplate(
 void ExternalizeStringExtension::Externalize(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   if (args.Length() < 1 || !args[0]->IsString()) {
-    args.GetIsolate()->ThrowException(v8::String::NewFromUtf8(
-        args.GetIsolate(),
-        "First parameter to externalizeString() must be a string."));
+    args.GetIsolate()->ThrowException(
+        v8::String::NewFromUtf8(
+            args.GetIsolate(),
+            "First parameter to externalizeString() must be a string.",
+            NewStringType::kNormal).ToLocalChecked());
     return;
   }
   bool force_two_byte = false;
   if (args.Length() >= 2) {
     if (args[1]->IsBoolean()) {
-      force_two_byte = args[1]->BooleanValue();
+      force_two_byte =
+          args[1]
+              ->BooleanValue(args.GetIsolate()->GetCurrentContext())
+              .FromJust();
     } else {
-      args.GetIsolate()->ThrowException(v8::String::NewFromUtf8(
-        args.GetIsolate(),
-        "Second parameter to externalizeString() must be a boolean."));
+      args.GetIsolate()->ThrowException(
+          v8::String::NewFromUtf8(
+              args.GetIsolate(),
+              "Second parameter to externalizeString() must be a boolean.",
+              NewStringType::kNormal).ToLocalChecked());
       return;
     }
   }
   bool result = false;
   Handle<String> string = Utils::OpenHandle(*args[0].As<v8::String>());
   if (string->IsExternalString()) {
-    args.GetIsolate()->ThrowException(v8::String::NewFromUtf8(
-        args.GetIsolate(),
-        "externalizeString() can't externalize twice."));
+    args.GetIsolate()->ThrowException(
+        v8::String::NewFromUtf8(args.GetIsolate(),
+                                "externalizeString() can't externalize twice.",
+                                NewStringType::kNormal).ToLocalChecked());
     return;
   }
   if (string->IsOneByteRepresentation() && !force_two_byte) {
@@ -102,8 +110,10 @@ void ExternalizeStringExtension::Externalize(
     if (!result) delete resource;
   }
   if (!result) {
-    args.GetIsolate()->ThrowException(v8::String::NewFromUtf8(
-        args.GetIsolate(), "externalizeString() failed."));
+    args.GetIsolate()->ThrowException(
+        v8::String::NewFromUtf8(args.GetIsolate(),
+                                "externalizeString() failed.",
+                                NewStringType::kNormal).ToLocalChecked());
     return;
   }
 }
@@ -112,9 +122,11 @@ void ExternalizeStringExtension::Externalize(
 void ExternalizeStringExtension::IsOneByte(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   if (args.Length() != 1 || !args[0]->IsString()) {
-    args.GetIsolate()->ThrowException(v8::String::NewFromUtf8(
-        args.GetIsolate(),
-        "isOneByteString() requires a single string argument."));
+    args.GetIsolate()->ThrowException(
+        v8::String::NewFromUtf8(
+            args.GetIsolate(),
+            "isOneByteString() requires a single string argument.",
+            NewStringType::kNormal).ToLocalChecked());
     return;
   }
   bool is_one_byte =