Pass isolate to ScriptPromise and ScriptString constructors

Source/bindings/v8/ScriptPromise.h

Index: Source/bindings/v8/ScriptPromise.h
diff --git a/Source/bindings/v8/ScriptPromise.h b/Source/bindings/v8/ScriptPromise.h
index 8ed4f0812ce48ad9022870894c8ff8aee3189c8e..c4f3e5dd07f88e8295eb7265bb111c55e873b965 100644
--- a/Source/bindings/v8/ScriptPromise.h
+++ b/Source/bindings/v8/ScriptPromise.h
@@ -50,15 +50,14 @@ public:
     {
     }
 
-    explicit ScriptPromise(ScriptValue promise)
+    explicit ScriptPromise(const ScriptValue& promise)
         : m_promise(promise)
     {
         ASSERT(!m_promise.hasNoValue());
     }
 
-    // FIXME: This constructor should take an isolate.
-    explicit ScriptPromise(v8::Handle<v8::Value> promise)
-        : m_promise(promise, v8::Isolate::GetCurrent())
+    ScriptPromise(v8::Handle<v8::Value> promise, v8::Isolate* isolate)
+        : m_promise(promise, isolate)
     {
         ASSERT(!m_promise.hasNoValue());
     }