DevTools: Remove unused variables. Disallow unused variables with eslint

third_party/WebKit/Source/devtools/front_end/sass/SASSSupport.js

 // Copyright 2015 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.
 Sass.SASSSupport = {};
 
 /**
  * @param {string} url
  * @param {string} content
  * @return {!Promise<!Sass.SASSSupport.AST>}
  */
@@ skipping 21 matching lines @@
       rules.push(rule);
     }
     return new Sass.SASSSupport.AST(document, rules);
   }
 
   /**
    * @param {!Object} payload
    */
   function createTextNode(payload) {
     var range = Common.TextRange.fromObject(payload);
-    var value = text.extract(range);
     return new Sass.SASSSupport.TextNode(document, text.extract(range), range);
   }
 
   /**
    * @param {!Object} payload
    */
   function createProperty(payload) {
     var name = createTextNode(payload.name);
     var value = createTextNode(payload.value);
     return new Sass.SASSSupport.Property(
@@ skipping 605 matching lines @@
     mapping.set(oldProperty.name, newProperty.name);
     mapping.set(oldProperty.value, newProperty.value);
     if (oldProperty.name.text.trim() !== newProperty.name.text.trim())
       addChange(T.NameChanged, oldRule, newRule, oldPropertyIndex, newPropertyIndex);
     if (oldProperty.value.text.trim() !== newProperty.value.text.trim())
       addChange(T.ValueChanged, oldRule, newRule, oldPropertyIndex, newPropertyIndex);
     if (oldProperty.disabled !== newProperty.disabled)
       addChange(T.PropertyToggled, oldRule, newRule, oldPropertyIndex, newPropertyIndex);
   }
 };