Use chomp not chop to strip newlines from results

tools/tinderbox/build-seamonkey-util.pl

@@ -22,7 +22,7 @@ use File::Path;     # for rmtree();
 use Config;         # for $Config{sig_name} and $Config{sig_num}
 use File::Find ();
 
-$::UtilsVersion = '$Revision: 1.184 $ ';
+$::UtilsVersion = '$Revision: 1.185 $ ';
 
 package TinderUtils;
 
@@ -1905,7 +1905,7 @@ sub StartupPerformanceTest {
     print_log "\nSummary for startup test:\n";
     
     # Print startup times.
-    chop(@times);
+    chomp(@times);
     my $times_string = join(" ", @times);
     print_log "times = [$times_string]\n";