[DevTools] Replace usages of document with custom functions.

Source/devtools/front_end/extensions/ExtensionServer.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 210 matching lines @@
                     allHeaders[name] = headers[name];
             }
         }
         NetworkAgent.setExtraHTTPHeaders(allHeaders);
     },
 
     _onApplyStyleSheet: function(message)
     {
         if (!Runtime.experiments.isEnabled("applyCustomStylesheet"))
             return;
-        var styleSheet = document.createElement("style");
+        var styleSheet = createElement("style");
         styleSheet.textContent = message.styleSheet;
         document.head.appendChild(styleSheet);
     },
 
     _onCreatePanel: function(message, port)
     {
         var id = message.id;
         // The ids are generated on the client API side and must be unique, so the check below
         // shouldn't be hit unless someone is bypassing the API.
         if (id in this._clientObjects || WebInspector.inspectorView.hasPanel(id))
@@ skipping 556 matching lines @@
             if (!originMatch) {
                 console.error("Skipping extension with invalid URL: " + startPage);
                 return false;
             }
             var extensionOrigin = originMatch[1];
             if (!this._registeredExtensions[extensionOrigin]) {
                 // See ExtensionAPI.js for details.
                 InspectorFrontendHost.setInjectedScriptForOrigin(extensionOrigin, buildExtensionAPIInjectedScript(extensionInfo));
                 this._registeredExtensions[extensionOrigin] = { name: name };
             }
-            var iframe = document.createElement("iframe");
+            var iframe = createElement("iframe");
             iframe.src = startPage;
             iframe.style.display = "none";
             document.body.appendChild(iframe);
         } catch (e) {
             console.error("Failed to initialize extension " + startPage + ":" + e);
             return false;
         }
         return true;
     },
 
@@ skipping 264 matching lines @@
     this.E_FAILED = makeStatus.bind(null, "E_FAILED", "Operation failed: %s");
 }
 
 /**
  * @typedef {{code: string, description: string, details: !Array.<*>}}
  */
 WebInspector.ExtensionStatus.Record;
 
 WebInspector.extensionAPI = {};
 defineCommonExtensionSymbols(WebInspector.extensionAPI);