Revert "Make sigchain actually own the signal chain."

This reverts commit 7600fa9234e02cf5108a3a82babf3d3ab82fcddd.

Change-Id: Ia46db2a7df0c0ac07107a8db06f42ff1afd4a97e
diff --git a/runtime/fault_handler.h b/runtime/fault_handler.h
index d56cf17..ce59ba7 100644
--- a/runtime/fault_handler.h
+++ b/runtime/fault_handler.h
@@ -42,9 +42,9 @@
 
   // Unclaim signals and delete registered handlers.
   void Shutdown();
+  void EnsureArtActionInFrontOfSignalChain();
 
-  // Try to handle a fault, returns true if successful.
-  bool HandleFault(int sig, siginfo_t* info, void* context);
+  void HandleFault(int sig, siginfo_t* info, void* context);
 
   // Added handlers are owned by the fault handler and will be freed on Shutdown().
   void AddHandler(FaultHandler* handler, bool generated_code);