Revert "Tidy gAborting."

Creates infinite loop: b/18674776.

This reverts commit 015b137efb434528173779bc3ec8d72494456254.

Change-Id: I67fe310d2e95ee2ec37bec842be06fb1123b6f4e
diff --git a/runtime/runtime_android.cc b/runtime/runtime_android.cc
index 33641ed..33600dd 100644
--- a/runtime/runtime_android.cc
+++ b/runtime/runtime_android.cc
@@ -38,6 +38,7 @@
     _exit(1);
   }
   handling_unexpected_signal = true;
+  gAborting++;  // set before taking any locks
   MutexLock mu(Thread::Current(), *Locks::unexpected_signal_lock_);
 
   Runtime* runtime = Runtime::Current();