DevTools: WI.SourceCodeDiff should not depend on UISourceCode

third_party/WebKit/Source/devtools/front_end/sources/SourceCodeDiff.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
- * @param {!WebInspector.UISourceCode} uiSourceCode
+ * @param {!Promise<?string>} diffBaseline
  * @param {!WebInspector.CodeMirrorTextEditor} textEditor
  */
-WebInspector.SourceCodeDiff = function(uiSourceCode, textEditor)
+WebInspector.SourceCodeDiff = function(diffBaseline, textEditor)
 {
-    this._uiSourceCode = uiSourceCode;
     this._textEditor = textEditor;
     this._decorations = [];
     this._textEditor.installGutter(WebInspector.SourceCodeDiff.DiffGutterType, true);
-    this._diffBaseline = this._uiSourceCode.requestOriginalContent();
+    this._diffBaseline = diffBaseline;
     /** @type {!Array<!WebInspector.TextEditorPositionHandle>}*/
     this._animatedLines = [];
 }
 
 /** @type {number} */
 WebInspector.SourceCodeDiff.UpdateTimeout = 200;
 
 /** @type {string} */
 WebInspector.SourceCodeDiff.DiffGutterType = "CodeMirror-gutter-diff";
 
@@ skipping 159 matching lines @@
             hasAdded = false;
             hasRemoved = false;
         }
     },
 
     /**
      * @param {?string} baseline
      */
     _innerUpdate: function(baseline)
     {
-        var current = this._uiSourceCode.workingCopy();
-        if (typeof current !== "string" || typeof baseline !== "string") {
+        var current = this._textEditor.text();
+        if (typeof baseline !== "string") {
             this._updateDecorations(this._decorations, [] /* added */);
             this._decorations = [];
             return;
         }
 
         var diff = this._computeDiff(baseline, current);
 
         /** @type {!Map<number, !WebInspector.SourceCodeDiff.GutterDecoration>} */
         var oldDecorations = new Map();
         for (var i = 0; i < this._decorations.length; ++i) {
@@ skipping 72 matching lines @@
 
     remove: function()
     {
         var location = this._position.resolve();
         if (!location)
             return;
         this._textEditor.setGutterDecoration(location.lineNumber, WebInspector.SourceCodeDiff.DiffGutterType, null);
         this._textEditor.toggleLineClass(location.lineNumber, this._className, false);
     }
 }