Clean up host aborts (and simplify the code).

Change-Id: I6efaf065304459df0e030f242f8d1d2fc6fdec4a
diff --git a/src/logging.cc b/src/logging.cc
index 4aacd3b..b0f3055 100644
--- a/src/logging.cc
+++ b/src/logging.cc
@@ -55,7 +55,7 @@
 
   // Abort if necessary.
   if (data_->severity == FATAL) {
-    Runtime::Abort(data_->file, data_->line_number);
+    Runtime::Abort();
   }
 
   delete data_;