[DevTools] Replace usages of document with custom functions.

Source/devtools/front_end/profiler/HeapSnapshotView.js

Index: Source/devtools/front_end/profiler/HeapSnapshotView.js
diff --git a/Source/devtools/front_end/profiler/HeapSnapshotView.js b/Source/devtools/front_end/profiler/HeapSnapshotView.js
index c799271664fe01cc974fd1ff562f002fce220b08..a2b97119cbf09b5ea29cfb88711040b3322f36ac 100644
--- a/Source/devtools/front_end/profiler/HeapSnapshotView.js
+++ b/Source/devtools/front_end/profiler/HeapSnapshotView.js
@@ -107,7 +107,7 @@ WebInspector.HeapSnapshotView = function(dataDisplayDelegate, profile)
         splitViewResizer = this._tabbedPane.headerElement();
         this._objectDetailsView = this._tabbedPane;
     } else {
-        var retainmentViewHeader = document.createElementWithClass("div", "heap-snapshot-view-resizer");
+        var retainmentViewHeader = createElementWithClass("div", "heap-snapshot-view-resizer");
         var retainingPathsTitleDiv = retainmentViewHeader.createChild("div", "title");
         var retainingPathsTitle = retainingPathsTitleDiv.createChild("span");
         retainingPathsTitle.textContent = WebInspector.UIString("Retainers");
@@ -361,7 +361,7 @@ WebInspector.HeapSnapshotView.AllocationPerspective = function()
     WebInspector.HeapSnapshotView.Perspective.call(this,  WebInspector.UIString("Allocation"));
     this._allocationSplitView = new WebInspector.SplitView(false, true, "heapSnapshotAllocationSplitViewState", 200, 200);
 
-    var resizer = document.createElementWithClass("div", "heap-snapshot-view-resizer");
+    var resizer = createElementWithClass("div", "heap-snapshot-view-resizer");
     var title = resizer.createChild("div", "title").createChild("span");
     title.textContent = WebInspector.UIString("Live objects");
     this._allocationSplitView.hideDefaultResizer();