Some perf improvements to sheriff-o-matics updates.

Tools/GardeningServer/model/ct-failure.html

Index: Tools/GardeningServer/model/ct-failure.html
diff --git a/Tools/GardeningServer/model/ct-failure.html b/Tools/GardeningServer/model/ct-failure.html
index 30576156a7eed48aaab8c5236db8951d2f7f14a2..90a9bbc3c5254c4edf44daaa33fb6480770f3359 100644
--- a/Tools/GardeningServer/model/ct-failure.html
+++ b/Tools/GardeningServer/model/ct-failure.html
@@ -68,7 +68,7 @@ CTFailure.prototype.annotations = function() {
 CTFailure.createKey = function(alert) {
   function normalize(str) {
     str = str == null ? '' : String(str);
-    return str.replace(/:/g, '_');
+    return str.replace(':', '_');

[esprehn, 2014/09/10 02:40:23]

This doesn't do the same thing, it used to replace all : now it only does the
first one.

   }
   return [alert.master_url, alert.builder_name, alert.failing_build, alert.step_name, alert.reason].map(normalize).join('::');
 }