Remove profiler signal handler on shutdown

runtime/vm/thread_interrupter.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_THREAD_INTERRUPTER_H_
 #define VM_THREAD_INTERRUPTER_H_
 
 #include "vm/allocation.h"
 #include "vm/signal_handler.h"
 #include "vm/os_thread.h"
@@ skipping 74 matching lines @@
 
   static InterruptableThreadState* _EnsureThreadStateCreated();
   static void UpdateStateObject(ThreadInterruptCallback callback, void* data);
 
   static void SetCurrentThreadState(InterruptableThreadState* state);
 
   static void ThreadMain(uword parameters);
 
   static void InstallSignalHandler();
 
+  static void RemoveSignalHandler();
+
   friend class ThreadInterrupterVisitIsolates;
 };
 
 void ThreadInterruptNoOp(const InterruptedThreadState& state, void* data);
 
 }  // namespace dart
 
 #endif  // VM_THREAD_INTERRUPTER_H_