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

chrome/browser/extensions/extension_resource_request_policy_apitest.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 "base/command_line.h"
 #include "base/logging.h"
 #include "build/build_config.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ skipping 331 matching lines @@
   ASSERT_TRUE(content::ExecuteScript(web_contents, "navigateFrameNow()"));
   WaitForLoadStop(web_contents);
   EXPECT_NE(private_page, web_contents->GetLastCommittedURL());
   std::string content;
   EXPECT_TRUE(ExecuteScriptAndExtractString(
       ChildFrameAt(web_contents->GetMainFrame(), 0),
       "domAutomationController.send(document.body.innerText)", &content));
 
   // The iframe should not load |private_page|, which is not web-accessible.
   //
-  // TODO(alexmos): The failure mode differs on whether or not
-  // --isolate-extensions is used: if it is on, the request is canceled and we
-  // stay on public.html (see https://crbug.com/656752), and if it's off, the
-  // request is blocked in ExtensionNavigationThrottle, which loads an error
-  // page into the iframe.  This check handles both cases, but we should make
-  // the check stricter once --isolate-extensions is on by default.
+  // TODO(alexmos): Make this check stricter, as extensions are now fully
+  // isolated. The failure mode is that the request is canceled and we stay on
+  // public.html (see https://crbug.com/656752).
   EXPECT_NE("Private", content);
 }