Improve handling of failed integer type conversions.

Source/bindings/v8/custom/V8PromiseCustom.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 610 matching lines @@
 
 v8::Local<v8::Object> V8PromiseCustom::getInternal(v8::Handle<v8::Object> promise)
 {
     v8::Local<v8::Value> value = promise->GetInternalField(v8DOMWrapperObjectIndex);
     return value.As<v8::Object>();
 }
 
 V8PromiseCustom::PromiseState V8PromiseCustom::getState(v8::Handle<v8::Object> internal)
 {
     v8::Handle<v8::Value> value = internal->GetInternalField(V8PromiseCustom::InternalStateIndex);
-    bool ok = false;
-    uint32_t number = toInt32(value, ok);
-    ASSERT(ok && (number == Pending || number == Fulfilled || number == Rejected || number == Following));
+    uint32_t number = toInt32(value);
+    ASSERT(number == Pending || number == Fulfilled || number == Rejected || number == Following);
     return static_cast<PromiseState>(number);
 }
 
 void V8PromiseCustom::setState(v8::Handle<v8::Object> internal, PromiseState state, v8::Handle<v8::Value> value, v8::Isolate* isolate)
 {
     ASSERT(!value.IsEmpty());
     ASSERT(state == Pending || state == Fulfilled || state == Rejected || state == Following);
     internal->SetInternalField(InternalStateIndex, v8::Integer::New(isolate, state));
     internal->SetInternalField(InternalResultIndex, value);
 }
@@ skipping 141 matching lines @@
 }
 
 void V8PromiseCustom::callHandler(v8::Handle<v8::Object> promise, v8::Handle<v8::Function> handler, v8::Handle<v8::Value> argument, v8::Isolate* isolate)
 {
     ExecutionContext* executionContext = getExecutionContext();
     ASSERT(executionContext && executionContext->isContextThread());
     executionContext->postTask(adoptPtr(new CallHandlerTask(promise, handler, argument, isolate, executionContext)));
 }
 
 } // namespace WebCore