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

chrome/common/chrome_content_client.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/common/chrome_content_client.h"
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
@@ skipping 670 matching lines @@
     const GURL& script_url) {
 #if BUILDFLAG(ENABLE_EXTENSIONS)
   return script_url.SchemeIs(extensions::kExtensionScheme);
 #else
   return false;
 #endif
 }
 
 bool ChromeContentClient::IsSupplementarySiteIsolationModeEnabled() {
 #if BUILDFLAG(ENABLE_EXTENSIONS)
-  return extensions::IsIsolateExtensionsEnabled();
+  return true;
 #else
   return false;
 #endif
 }
 
 content::OriginTrialPolicy* ChromeContentClient::GetOriginTrialPolicy() {
   if (!origin_trial_policy_)
     origin_trial_policy_ = base::MakeUnique<ChromeOriginTrialPolicy>();
   return origin_trial_policy_.get();
 }
 
 #if defined(OS_ANDROID)
 media::MediaDrmBridgeClient* ChromeContentClient::GetMediaDrmBridgeClient() {
   return new ChromeMediaDrmBridgeClient();
 }
 #endif  // OS_ANDROID