Add toWebCoreString() / toWebCoreAtomicString() overloads taking a v8::String

Source/bindings/v8/ScriptValue.cpp

Index: Source/bindings/v8/ScriptValue.cpp
diff --git a/Source/bindings/v8/ScriptValue.cpp b/Source/bindings/v8/ScriptValue.cpp
index b342697e1a64862b83b6e02b902417371b0f60f0..d9fb33806a89d95989d74f6831fd5b76b2025707 100644
--- a/Source/bindings/v8/ScriptValue.cpp
+++ b/Source/bindings/v8/ScriptValue.cpp
@@ -71,7 +71,7 @@ bool ScriptValue::getString(String& result, v8::Isolate* isolate) const
     v8::Handle<v8::Value> string = v8Value();
     if (string.IsEmpty() || !string->IsString())
         return false;
-    result = toWebCoreString(string);
+    result = toWebCoreString(string.As<v8::String>());
     return true;
 }
 
@@ -102,7 +102,7 @@ static PassRefPtr<JSONValue> v8ToJSONValue(v8::Handle<v8::Value> value, int maxD
     if (value->IsNumber())
         return JSONBasicValue::create(value->NumberValue());
     if (value->IsString())
-        return JSONString::create(toWebCoreString(value));
+        return JSONString::create(toWebCoreString(value.As<v8::String>()));
     if (value->IsArray()) {
         v8::Handle<v8::Array> array = v8::Handle<v8::Array>::Cast(value);
         RefPtr<JSONArray> inspectorArray = JSONArray::create();