Remove command line/field trial support and configs for Isolate Extensions.

chrome/browser/extensions/chrome_extension_web_contents_observer.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_CHROME_EXTENSION_WEB_CONTENTS_OBSERVER_H_
 #define CHROME_BROWSER_EXTENSIONS_CHROME_EXTENSION_WEB_CONTENTS_OBSERVER_H_
 
 #include <stdint.h>
 
 #include "base/compiler_specific.h"
@@ skipping 39 matching lines @@
   void OnDetailedConsoleMessageAdded(
       content::RenderFrameHost* render_frame_host,
       const base::string16& message,
       const base::string16& source,
       const StackTrace& stack_trace,
       int32_t severity_level);
 
   // Reloads an extension if it is on the terminated list.
   void ReloadIfTerminated(content::RenderViewHost* render_view_host);
 
-  // Determines which bucket of a synthetic field trial this client belongs
-  // to and sets it.
-  void SetExtensionIsolationTrial(content::RenderFrameHost* render_frame_host);
-
   DISALLOW_COPY_AND_ASSIGN(ChromeExtensionWebContentsObserver);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_CHROME_EXTENSION_WEB_CONTENTS_OBSERVER_H_