DevTools: Adopt nbsp as unit & thousands separator for broader font support

third_party/WebKit/Source/devtools/front_end/profiler/HeapSnapshotGridNodes.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 133 matching lines @@
    */
   wasDetached() {
     this._dataGrid.nodeWasDetached(this);
   }
 
   /**
    * @param {number} num
    * @return {string}
    */
   _toPercentString(num) {
-    return num.toFixed(0) + '\u2009%';  // \u2009 is a thin space.
+    return num.toFixed(0) + '\xa0%';  // \xa0 is a non-breaking space.
   }
 
   /**
    * @param {number} distance
    * @return {string}
    */
   _toUIDistance(distance) {
     var baseSystemDistance = HeapSnapshotModel.baseSystemDistance;
     return distance >= 0 && distance < baseSystemDistance ? Common.UIString('%d', distance) : Common.UIString('\u2212');
   }
@@ skipping 1279 matching lines @@
     return cell;
   }
 
   /**
    * @return {number}
    */
   allocationNodeId() {
     return this._allocationNode.id;
   }
 };