bindings: Use Maybe APIs in V8ScriptRunner (part 1)

Source/bindings/core/v8/NPV8Object.cpp

Index: Source/bindings/core/v8/NPV8Object.cpp
diff --git a/Source/bindings/core/v8/NPV8Object.cpp b/Source/bindings/core/v8/NPV8Object.cpp
index dfef2fc9d7b3dd4cb63fe33c4fc4fb245c9f740b..e3bd7cf4259d1aa7c47cba76e68c905b2ff93e84 100644
--- a/Source/bindings/core/v8/NPV8Object.cpp
+++ b/Source/bindings/core/v8/NPV8Object.cpp
@@ -555,8 +555,9 @@ bool _NPN_Enumerate(NPP npp, NPObject* npObject, NPIdentifier** identifier, uint
             "  return props;"
             "});";
         v8::Handle<v8::String> source = v8AtomicString(isolate, enumeratorCode);
-        v8::Handle<v8::Value> result = V8ScriptRunner::compileAndRunInternalScript(source, isolate);
-        ASSERT(!result.IsEmpty());
+        v8::Local<v8::Value> result;
+        if (!V8ScriptRunner::compileAndRunInternalScript(source, isolate).ToLocal(&result))
+            return false;
         ASSERT(result->IsFunction());
         v8::Handle<v8::Function> enumerator = v8::Handle<v8::Function>::Cast(result);
         v8::Handle<v8::Value> argv[] = { obj };