Minor cleanup

runtime/vm/thread_interrupter.h

Index: runtime/vm/thread_interrupter.h
diff --git a/runtime/vm/thread_interrupter.h b/runtime/vm/thread_interrupter.h
index 9a70e497c413c221977b441884a0236e600f975c..535761581fb1f96b92677a6d9a03574be9dda716 100644
--- a/runtime/vm/thread_interrupter.h
+++ b/runtime/vm/thread_interrupter.h
@@ -12,6 +12,15 @@
 
 namespace dart {
 
+struct InterruptedThreadState {
+  uintptr_t pc;
+  uintptr_t csp;
+  uintptr_t dsp;
+  uintptr_t fp;
+  uintptr_t lr;
+};
+
+
 class ThreadInterrupter : public AllStatic {
  public:
   static void InitOnce();
@@ -43,8 +52,6 @@ class ThreadInterrupter : public AllStatic {
     return current_wait_time_ == Monitor::kNoTimeout;
   }
 
-  static void UpdateStateObject(ThreadInterruptCallback callback, void* data);
-
   static void ThreadMain(uword parameters);
 
   static void InstallSignalHandler();