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

chrome/renderer/extensions/chrome_extensions_renderer_client.cc

 // 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.
 
 #include "chrome/renderer/extensions/chrome_extensions_renderer_client.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 59 matching lines @@
       extensions::RendererExtensionRegistry::Get();
 
   // If old_url is still empty and this is an initial navigation, then this is
   // a window.open operation.  We should look at the opener URL.  Note that the
   // opener is a local frame in this case.
   if (is_initial_navigation && old_url.is_empty() && frame->Opener()) {
     blink::WebLocalFrame* opener_frame = frame->Opener()->ToWebLocalFrame();
 
     // We want to compare against the URL that determines the type of
     // process.  Use the URL of the opener's local frame root, which will
-    // correctly handle any site isolation modes (--site-per-process and
-    // --isolate-extensions).
+    // correctly handle any site isolation modes (e.g. --site-per-process).
     blink::WebLocalFrame* local_root = opener_frame->LocalRoot();
     old_url = local_root->GetDocument().Url();
 
     // If we're about to open a normal web page from a same-origin opener stuck
     // in an extension process (other than the Chrome Web Store), we want to
     // keep it in process to allow the opener to script it.
     blink::WebDocument opener_document = opener_frame->GetDocument();
     blink::WebSecurityOrigin opener_origin =
         opener_document.GetSecurityOrigin();
     bool opener_is_extension_url =
@@ skipping 214 matching lines @@
 
 void ChromeExtensionsRendererClient::RunScriptsAtDocumentEnd(
     content::RenderFrame* render_frame) {
   extension_dispatcher_->RunScriptsAtDocumentEnd(render_frame);
 }
 
 void ChromeExtensionsRendererClient::RunScriptsAtDocumentIdle(
     content::RenderFrame* render_frame) {
   extension_dispatcher_->RunScriptsAtDocumentIdle(render_frame);
 }