Revert "Tidy gAborting."

Creates infinite loop: b/18674776.

This reverts commit 015b137efb434528173779bc3ec8d72494456254.

Change-Id: I67fe310d2e95ee2ec37bec842be06fb1123b6f4e
diff --git a/runtime/base/logging.h b/runtime/base/logging.h
index a9cc99b..ae83e33 100644
--- a/runtime/base/logging.h
+++ b/runtime/base/logging.h
@@ -55,6 +55,11 @@
 // Global log verbosity setting, initialized by InitLogging.
 extern LogVerbosity gLogVerbosity;
 
+// 0 if not abort, non-zero if an abort is in progress. Used on fatal exit to prevents recursive
+// aborts. Global declaration allows us to disable some error checking to ensure fatal shutdown
+// makes forward progress.
+extern unsigned int gAborting;
+
 // Configure logging based on ANDROID_LOG_TAGS environment variable.
 // We need to parse a string that looks like
 //