[DevTools] Prepare to move Popover to shadow DOM.

third_party/WebKit/Source/devtools/front_end/profiler/HeapSnapshotView.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 242 matching lines @@
   wasShown() {
     this._profile._loadPromise.then(this._profile._wasShown.bind(this._profile));
   }
 
   /**
    * @override
    */
   willHide() {
     this._currentSearchResultIndex = -1;
     this._popoverHelper.hidePopover();
-    if (this.helpPopover && this.helpPopover.isShowing())
-      this.helpPopover.hide();
   }
 
   /**
    * @override
    * @return {boolean}
    */
   supportsCaseSensitiveSearch() {
     return true;
   }
 
@@ skipping 1815 matching lines @@
       var name = frameDiv.createChild('div');
       name.textContent = UI.beautifyFunctionName(frame.functionName);
       if (frame.scriptId) {
         var urlElement = this._linkifier.linkifyScriptLocation(
             this._target, String(frame.scriptId), frame.scriptName, frame.line - 1, frame.column - 1);
         frameDiv.appendChild(urlElement);
       }
     }
   }
 };