ScriptState::contextIsEmpty shouldn't return true for a context whose global object is detached

Source/bindings/core/v8/ScheduledAction.cpp

Index: Source/bindings/core/v8/ScheduledAction.cpp
diff --git a/Source/bindings/core/v8/ScheduledAction.cpp b/Source/bindings/core/v8/ScheduledAction.cpp
index 423c46aac734081dfac72c1fab1d8eaeed9b0949..b7ce1d39f3caea07704b8065ff05bd6fc230e44e 100644
--- a/Source/bindings/core/v8/ScheduledAction.cpp
+++ b/Source/bindings/core/v8/ScheduledAction.cpp
@@ -89,7 +89,7 @@ void ScheduledAction::execute(ExecutionContext* context)
 
 void ScheduledAction::execute(LocalFrame* frame)
 {
-    if (m_scriptState->contextIsEmpty()) {
+    if (m_scriptState->contextIsValid()) {
         WTF_LOG(Timers, "ScheduledAction::execute %p: context is empty", this);
         return;
     }
@@ -112,7 +112,7 @@ void ScheduledAction::execute(LocalFrame* frame)
 void ScheduledAction::execute(WorkerGlobalScope* worker)
 {
     ASSERT(worker->thread()->isCurrentThread());
-    ASSERT(!m_scriptState->contextIsEmpty());
+    ASSERT(!m_scriptState->contextIsValid());
     if (!m_function.isEmpty()) {
         ScriptState::Scope scope(m_scriptState.get());
         Vector<v8::Handle<v8::Value> > info;