DevTools: introduce uiSourceCode.mimeType() method

third_party/WebKit/Source/devtools/front_end/changes/ChangesView.js

 // Copyright 2017 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.
 
 Changes.ChangesView = class extends UI.VBox {
   constructor() {
     super(true);
     this.registerRequiredCSS('changes/changesView.css');
     var splitWidget = new UI.SplitWidget(true /* vertical */, false /* sidebar on left */);
     var mainWidget = new UI.Widget();
@@ skipping 160 matching lines @@
         '%d insertion%s (+), %d deletion%s (-)', insertions, insertions !== 1 ? 's' : '', deletions,
         deletions !== 1 ? 's' : ''));
     this._toolbar.setEnabled(true);
     this._emptyWidget.hideWidget();
 
     this._editor.operation(() => {
       this._editor.showWidget();
       this._editor.setHighlightMode({
         name: 'devtools-diff',
         diffRows: this._diffRows,
-        mimeType: Bindings.NetworkProject.uiSourceCodeMimeType(
-            /** @type {!Workspace.UISourceCode} */ (this._selectedUISourceCode)),
+        mimeType: /** @type {!Workspace.UISourceCode} */ (this._selectedUISourceCode).mimeType(),
         baselineLines: originalLines,
         currentLines: currentLines
       });
       this._editor.setText(this._diffRows.map(row => row.tokens.map(t => t.text).join('')).join('\n'));
       this._editor.setLineNumberFormatter(this._lineFormatter.bind(this));
     });
 
     /**
      * @param {!Array<string>} lines
      * @param {boolean} atStart
@@ skipping 108 matching lines @@
  */
 Changes.ChangesView.Row;
 
 /** @enum {string} */
 Changes.ChangesView.RowType = {
   Deletion: 'deletion',
   Addition: 'addition',
   Equal: 'equal',
   Spacer: 'spacer'
 };