[DevTools] Replace usages of document with custom functions.

Source/devtools/front_end/audits/AuditFormatters.js

Index: Source/devtools/front_end/audits/AuditFormatters.js
diff --git a/Source/devtools/front_end/audits/AuditFormatters.js b/Source/devtools/front_end/audits/AuditFormatters.js
index e24ccce83c38955753d0414d46097ef034a6943b..9b42613d1595e1a13d846bca719dcf062fd0c1c2 100644
--- a/Source/devtools/front_end/audits/AuditFormatters.js
+++ b/Source/devtools/front_end/audits/AuditFormatters.js
@@ -43,7 +43,7 @@ WebInspector.AuditFormatters.Registry = {
      */
     text: function(text)
     {
-        return document.createTextNode(text);
+        return createTextNode(text);
     },
 
     /**
@@ -52,7 +52,7 @@ WebInspector.AuditFormatters.Registry = {
      */
     snippet: function(snippetText)
     {
-        var div = document.createElement("div");
+        var div = createElement("div");
         div.textContent = snippetText;
         div.className = "source-code";
         return div;
@@ -63,7 +63,7 @@ WebInspector.AuditFormatters.Registry = {
      */
     concat: function()
     {
-        var parent = document.createElement("span");
+        var parent = createElement("span");
         for (var arg = 0; arg < arguments.length; ++arg)
             parent.appendChild(WebInspector.auditFormatters.apply(arguments[arg]));
         return parent;
@@ -77,7 +77,7 @@ WebInspector.AuditFormatters.Registry = {
      */
     url: function(url, displayText, allowExternalNavigation)
     {
-        var a = document.createElement("a");
+        var a = createElement("a");
         a.href = sanitizeHref(url);
         a.title = url;
         a.textContent = displayText || url;