WebFonts: reset m_loadLimitState on memory cache revalidation

third_party/WebKit/LayoutTests/http/tests/webfont/cachable-slow-ahem-loading.cgi

Index: third_party/WebKit/LayoutTests/http/tests/webfont/cachable-slow-ahem-loading.cgi
diff --git a/third_party/WebKit/LayoutTests/http/tests/webfont/slow-ahem-loading.cgi b/third_party/WebKit/LayoutTests/http/tests/webfont/cachable-slow-ahem-loading.cgi
similarity index 54%
copy from third_party/WebKit/LayoutTests/http/tests/webfont/slow-ahem-loading.cgi
copy to third_party/WebKit/LayoutTests/http/tests/webfont/cachable-slow-ahem-loading.cgi
index f62e4c40c948f8042b41756d83f181c0050adfb5..2399642163865aa68e9d53f9dbb9eb9e2018ed79 100755
--- a/third_party/WebKit/LayoutTests/http/tests/webfont/slow-ahem-loading.cgi
+++ b/third_party/WebKit/LayoutTests/http/tests/webfont/cachable-slow-ahem-loading.cgi
@@ -1,13 +1,16 @@
 #!/usr/bin/perl -wT
 use CGI;
+use HTTP::Date;
 use Time::HiRes;
 
 my $cgi = new CGI;
 my $delay = $cgi->param('delay');
 $delay = 1000 unless $delay;
+my $now = time2str(time);
 
-print "Content-type: application/octet-stream\n";
-print "Cache-control: no-cache, no-store\n\n";
+# Last-modified is needed so that memory cache decides to perform revalidation.
+print "Last-modified: $now\n";
+print "Content-type: application/octet-stream\n\n";
 Time::HiRes::sleep($delay / 1000);
 open FH, "<../resources/Ahem.ttf" or die;
 while (<FH>) { print; }