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

chrome/browser/extensions/api/tabs/tabs_test.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 <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <string>
@@ skipping 2129 matching lines @@
             browser()->tab_strip_model()->GetActiveWebContents());
   browser()->tab_strip_model()->ActivateTabAt(1, true);
   EXPECT_EQ(second_web_contents,
             browser()->tab_strip_model()->GetActiveWebContents());
 
   EXPECT_EQ(url, second_web_contents->GetVisibleURL());
 }
 
 // Window created by chrome.windows.create should be in the same SiteInstance
 // and BrowsingInstance as the opener - this is a regression test for
-// hangouts-vs-isolate-extensions-trouble (see also https://crbug.com/597750).
+// https://crbug.com/597750.
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, WindowsCreateVsSiteInstance) {
   const extensions::Extension* extension =
       LoadExtension(test_data_dir_.AppendASCII("../simple_with_file"));
   ASSERT_TRUE(extension);
 
   // Navigate a tab to an extension page.
   GURL extension_url = extension->GetResourceURL("file.html");
   ui_test_utils::NavigateToURL(browser(), extension_url);
   content::WebContents* old_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
@@ skipping 19 matching lines @@
 
   // Verify that the |new_contents| doesn't have a |window.opener| set.
   bool window_opener_cast_to_bool = true;
   EXPECT_TRUE(ExecuteScriptAndExtractBool(
       new_contents, "window.domAutomationController.send(!!window.opener)",
       &window_opener_cast_to_bool));
   EXPECT_FALSE(window_opener_cast_to_bool);
 }
 
 }  // namespace extensions