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

include/v8.h

 // Copyright 2012 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.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 7692 matching lines @@
   return (I::GetInstanceType(obj) < I::kFirstNonstringType);
 }
 
 
 template <class T> Value* Value::Cast(T* value) {
   return static_cast<Value*>(value);
 }
 
 
 Local<Boolean> Value::ToBoolean() const {
-  return ToBoolean(Isolate::GetCurrent());
+  return ToBoolean(Isolate::GetCurrent()->GetCurrentContext())
+      .FromMaybe(Local<Boolean>());
 }
 
 
 Local<Number> Value::ToNumber() const {
-  return ToNumber(Isolate::GetCurrent());
+  return ToNumber(Isolate::GetCurrent()->GetCurrentContext())
+      .FromMaybe(Local<Number>());
 }
 
 
 Local<String> Value::ToString() const {
-  return ToString(Isolate::GetCurrent());
+  return ToString(Isolate::GetCurrent()->GetCurrentContext())
+      .FromMaybe(Local<String>());
 }
 
 
 Local<String> Value::ToDetailString() const {
-  return ToDetailString(Isolate::GetCurrent());
+  return ToDetailString(Isolate::GetCurrent()->GetCurrentContext())
+      .FromMaybe(Local<String>());
 }
 
 
 Local<Object> Value::ToObject() const {
-  return ToObject(Isolate::GetCurrent());
+  return ToObject(Isolate::GetCurrent()->GetCurrentContext())
+      .FromMaybe(Local<Object>());
 }
 
 
 Local<Integer> Value::ToInteger() const {
-  return ToInteger(Isolate::GetCurrent());
+  return ToInteger(Isolate::GetCurrent()->GetCurrentContext())
+      .FromMaybe(Local<Integer>());
 }
 
 
 Local<Uint32> Value::ToUint32() const {
-  return ToUint32(Isolate::GetCurrent());
+  return ToUint32(Isolate::GetCurrent()->GetCurrentContext())
+      .FromMaybe(Local<Uint32>());
 }
 
 
-Local<Int32> Value::ToInt32() const { return ToInt32(Isolate::GetCurrent()); }
+Local<Int32> Value::ToInt32() const {
+  return ToInt32(Isolate::GetCurrent()->GetCurrentContext())
+      .FromMaybe(Local<Int32>());
+}
 
 
 Boolean* Boolean::Cast(v8::Value* value) {
 #ifdef V8_ENABLE_CHECKS
   CheckCast(value);
 #endif
   return static_cast<Boolean*>(value);
 }
 
 
@@ skipping 551 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_