Decrease call sites of ScriptState::current()

Source/bindings/v8/V8MutationCallback.cpp

Index: Source/bindings/v8/V8MutationCallback.cpp
diff --git a/Source/bindings/v8/V8MutationCallback.cpp b/Source/bindings/v8/V8MutationCallback.cpp
index e1f6323c272e5292eb8066b87b9afc7a6dfa34cd..f2f5d7d23e1a3790a3f2a8b6eb97c86b7a7e5f2f 100644
--- a/Source/bindings/v8/V8MutationCallback.cpp
+++ b/Source/bindings/v8/V8MutationCallback.cpp
@@ -36,12 +36,12 @@
 
 namespace WebCore {
 
-V8MutationCallback::V8MutationCallback(v8::Handle<v8::Function> callback, ExecutionContext* context, v8::Handle<v8::Object> owner, v8::Isolate* isolate)
-    : ActiveDOMCallback(context)
-    , m_callback(isolate, callback)
-    , m_scriptState(ScriptState::current(isolate))
+V8MutationCallback::V8MutationCallback(v8::Handle<v8::Function> callback, v8::Handle<v8::Object> owner, ScriptState* scriptState)
+    : ActiveDOMCallback(scriptState->executionContext())
+    , m_callback(scriptState->isolate(), callback)
+    , m_scriptState(scriptState)
 {
-    V8HiddenValue::setHiddenValue(isolate, owner, V8HiddenValue::callback(isolate), callback);
+    V8HiddenValue::setHiddenValue(scriptState->isolate(), owner, V8HiddenValue::callback(scriptState->isolate()), callback);
     m_callback.setWeak(this, &setWeakCallback);
 }