Avoid logging functions from signal handler.

Change-Id: Ic61f7054ced223631f95efb519fa1825fb3e1010
diff --git a/libbacktrace/UnwindCurrent.h b/libbacktrace/UnwindCurrent.h
index acce110..41080c7 100644
--- a/libbacktrace/UnwindCurrent.h
+++ b/libbacktrace/UnwindCurrent.h
@@ -34,7 +34,7 @@
 
   virtual std::string GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset);
 
-  bool UnwindFromContext(size_t num_ignore_frames, bool resolve);
+  bool UnwindFromContext(size_t num_ignore_frames, bool within_handler);
 
   void ExtractContext(void* sigcontext);