Reland of Switch V8HiddenValue from hidden values to privates

third_party/WebKit/Source/bindings/core/v8/V8HiddenValue.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8HiddenValue.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8HiddenValue.cpp b/third_party/WebKit/Source/bindings/core/v8/V8HiddenValue.cpp
index c0e1cc64ca5db06b60c0461146fdd027c87356c2..478729ed4873cbb409a88d73f2c2988a44b6a951 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8HiddenValue.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8HiddenValue.cpp
@@ -25,17 +25,25 @@
 
 v8::Local<v8::Value> V8HiddenValue::getHiddenValue(ScriptState* scriptState, v8::Local<v8::Object> object, v8::Local<v8::String> key)
 {
-    return object->GetHiddenValue(key);
+    v8::Local<v8::Context> context = scriptState->context();
+    v8::Local<v8::Private> privateKey = v8::Private::ForApi(scriptState->isolate(), key);
+    v8::Local<v8::Value> value;
+    // Callsites interpret an empty handle has absence of a result.
+    if (!v8CallBoolean(object->HasPrivate(context, privateKey)))
+        return v8::Local<v8::Value>();
+    if (object->GetPrivate(context, privateKey).ToLocal(&value))
+        return value;
+    return v8::Local<v8::Value>();
 }
 
 bool V8HiddenValue::setHiddenValue(ScriptState* scriptState, v8::Local<v8::Object> object, v8::Local<v8::String> key, v8::Local<v8::Value> value)
 {
-    return object->SetHiddenValue(key, value);
+    return v8CallBoolean(object->SetPrivate(scriptState->context(), v8::Private::ForApi(scriptState->isolate(), key), value));
 }
 
 bool V8HiddenValue::deleteHiddenValue(ScriptState* scriptState, v8::Local<v8::Object> object, v8::Local<v8::String> key)
 {
-    return object->DeleteHiddenValue(key);
+    return v8CallBoolean(object->DeletePrivate(scriptState->context(), v8::Private::ForApi(scriptState->isolate(), key)));
 }
 
 v8::Local<v8::Value> V8HiddenValue::getHiddenValueFromMainWorldWrapper(ScriptState* scriptState, ScriptWrappable* wrappable, v8::Local<v8::String> key)