DevTools/Coverage: fix decorations in HTML

third_party/WebKit/Source/devtools/front_end/coverage/CoverageModel.js

 // Copyright (c) 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.
 
 /** @typedef {{startOffset: number, endOffset: number, count: number}} */
 Coverage.RangeUseCount;
 
 /** @typedef {{end: number, count: (number|undefined)}} */
 Coverage.CoverageSegment;
 
@@ skipping 347 matching lines @@
    * @param {number} start
    * @param {number} end
    * @return {boolean}
    */
   usageForRange(start, end) {
     var index = this._segments.upperBound(start, (position, segment) => position - segment.end);
     for (; index < this._segments.length && this._segments[index].end < end; ++index) {
       if (this._segments[index].count)
         return true;
     }
-    return index < this._segments.length && this._segments[index].count;
+    return index < this._segments.length && !!this._segments[index].count;
   }
 
   /**
    * @param {!Array<!Coverage.CoverageSegment>} segmentsA
    * @param {!Array<!Coverage.CoverageSegment>} segmentsB
    */
   static _mergeCoverage(segmentsA, segmentsB) {
     var result = [];
 
     var indexA = 0;
@@ skipping 26 matching lines @@
     this._usedSize = 0;
 
     var last = 0;
     for (var segment of this._segments) {
       if (segment.count)
         this._usedSize += segment.end - last;
       last = segment.end;
     }
   }
 };