[DevTools] Replace usages of document with custom functions.

Source/devtools/front_end/sources/RevisionHistoryView.js

Index: Source/devtools/front_end/sources/RevisionHistoryView.js
diff --git a/Source/devtools/front_end/sources/RevisionHistoryView.js b/Source/devtools/front_end/sources/RevisionHistoryView.js
index 5990ba507abfc4300373243815c6aa0d1502e129..c25efccbb9ea0351cfce777e03d6b9266fd282ff 100644
--- a/Source/devtools/front_end/sources/RevisionHistoryView.js
+++ b/Source/devtools/front_end/sources/RevisionHistoryView.js
@@ -209,7 +209,7 @@ WebInspector.RevisionHistoryTreeElement = function(revision, baseRevision, allow
     this._revision = revision;
     this._baseRevision = baseRevision;
 
-    this._revertElement = document.createElement("span");
+    this._revertElement = createElement("span");
     this._revertElement.className = "revision-history-link";
     this._revertElement.textContent = WebInspector.UIString("apply revision content");
     this._revertElement.addEventListener("click", this._revision.revertToThis.bind(this._revision), false);
@@ -310,12 +310,12 @@ WebInspector.RevisionHistoryTreeElement.prototype = {
         var child = new TreeElement("", null, false);
         child.selectable = false;
         this.appendChild(child);
-        var lineElement = document.createElement("span");
+        var lineElement = createElement("span");
 
         function appendLineNumber(lineNumber)
         {
             var numberString = lineNumber !== null ? numberToStringWithSpacesPadding(lineNumber + 1, 4) : spacesPadding(4);
-            var lineNumberSpan = document.createElement("span");
+            var lineNumberSpan = createElement("span");
             lineNumberSpan.classList.add("webkit-line-number");
             lineNumberSpan.textContent = numberString;
             child.listItemElement.appendChild(lineNumberSpan);
@@ -324,7 +324,7 @@ WebInspector.RevisionHistoryTreeElement.prototype = {
         appendLineNumber(baseLineNumber);
         appendLineNumber(newLineNumber);
 
-        var contentSpan = document.createElement("span");
+        var contentSpan = createElement("span");
         contentSpan.textContent = lineContent;
         child.listItemElement.appendChild(contentSpan);
         child.listItemElement.classList.add("revision-history-line");