Use v8::Promise::Then in ScriptPromise::then.

Source/bindings/v8/ScriptPromise.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 61 matching lines @@
 
     v8::Local<v8::Object> promise = m_promise.v8Value().As<v8::Object>();
     v8::Local<v8::Function> v8OnFulfilled = ScriptFunction::adoptByGarbageCollector(onFulfilled);
     v8::Local<v8::Function> v8OnRejected = ScriptFunction::adoptByGarbageCollector(onRejected);
 
     ASSERT(promise->IsPromise());
     // Return this Promise if no handlers are given.
     // In fact it is not the exact bahavior of Promise.prototype.then
     // but that is not a problem in this case.
     v8::Local<v8::Promise> resultPromise = promise.As<v8::Promise>();
-    // FIXME: Use Then once it is introduced.
     if (!v8OnFulfilled.IsEmpty()) {
-        resultPromise = resultPromise->Chain(v8OnFulfilled);
+        resultPromise = resultPromise->Then(v8OnFulfilled);
         if (resultPromise.IsEmpty()) {
-            // v8::Promise::Chain may return an empty value, for example when
+            // v8::Promise::Then may return an empty value, for example when
             // the stack is exhausted.
             return ScriptPromise();
         }
     }
     if (!v8OnRejected.IsEmpty())
         resultPromise = resultPromise->Catch(v8OnRejected);
 
     return ScriptPromise(m_scriptState.get(), resultPromise);
 }
 
@@ skipping 30 matching lines @@
     return promise;
 }
 
 ScriptPromise ScriptPromise::rejectWithDOMException(ScriptState* scriptState, PassRefPtrWillBeRawPtr<DOMException> exception)
 {
     ASSERT(scriptState->isolate()->InContext());
     return reject(scriptState, ToV8Value<WithScriptState, v8::Handle<v8::Object> >::toV8Value(exception, scriptState->context()->Global(), scriptState->isolate()));
 }
 
 } // namespace WebCore