Fix status text in redirect-helper.pl.

I noticed this going through apache error_log.txt trying to diagnose
other failures (perl warns about uninitialized value). $STATUS_TEXTS is
a reference to a hash, so it should be accessed via
$STATUS_TEXTS->{$REDIRECT_CODE}. $STATUS_TEXTS{$REDIRECT_CODE} means it
is accessing %STATUS_TEXTS. Switch to the latter.

Bug: none
Change-Id: I177105deb451e88e8f21ca4a7e0cce7b21727991
Reviewed-on: https://chromium-review.googlesource.com/c/1340561Reviewed-by: Nate Chapin <japhet@chromium.org>
Commit-Queue: David Benjamin <davidben@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609502}

third_party/WebKit/LayoutTests/http/tests/history/resources/redirect-helper.pl

@@ -3,12 +3,12 @@
 
 $REDIRECT_CODE = $ENV{'QUERY_STRING'} || '301';
 
-$STATUS_TEXTS = {
+%STATUS_TEXTS = (
   '301' => 'Moved Permanently',
   '302' => 'Moved Temporarily',
   '303' => 'See Other',
   '307' => 'Moved Temporarily'
-};
+);
 
 print "Status: $REDIRECT_CODE $STATUS_TEXTS{$REDIRECT_CODE}\r\n";
 print "Location: redirect-target.html#2\r\n";