DevTools: revert Persistence2.0 experiment by default.

third_party/WebKit/Source/devtools/front_end/help/ReleaseNoteText.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.
 
 // NOTE: need to be careful about adding release notes early otherwise it'll
 // be shown in Canary (e.g. make sure the release notes are accurate).
 // https://github.com/ChromeDevTools/devtools-frontend/wiki/Release-Notes
 
 var commandMenuShortcut = Host.isMac() ? 'Command + Shift + P' : 'Control + Shift + P';
 
@@ skipping 20 matching lines @@
       },
       {
         title: 'Step over async await',
         subtitle: 'Step through async functions predictably.',
         link: 'https://developers.google.com/web/updates/2017/04/devtools-release-notes#async',
       },
       {
         title: 'Unified Command Menu',
         subtitle: 'Execute commands and open files from the newly-unified Command Menu (' + commandMenuShortcut + ').',
         link: 'https://developers.google.com/web/updates/2017/04/devtools-release-notes#command-menu',
-      },
-      {
-        title: 'Workspaces 2.0',
-        subtitle: 'Check out the new UX for using DevTools as your code editor.',
-        link: 'https://developers.google.com/web/updates/2017/04/devtools-release-notes#workspaces',
-      },
+      }
     ],
     link: 'https://developers.google.com/web/updates/2017/04/devtools-release-notes',
   },
   {
     version: 1,
     header: 'Highlights from Chrome 58 update',
     highlights: [
       {
         title: 'New Performance and Memory panels',
         subtitle: 'Head to Performance for JavaScript profiling',
@@ skipping 11 matching lines @@
       },
       {
         title: 'Debugger catches out-of-memory errors',
         subtitle: 'See the stack or grab a heap snapshot to see why the app may crash',
         link: 'https://developers.google.com/web/updates/2017/03/devtools-release-notes#out-of-memory-breakpoints',
       },
     ],
     link: 'https://developers.google.com/web/updates/2017/03/devtools-release-notes',
   }
 ];