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

chrome/browser/extensions/api/tabs/tabs_test.cc

Index: chrome/browser/extensions/api/tabs/tabs_test.cc
diff --git a/chrome/browser/extensions/api/tabs/tabs_test.cc b/chrome/browser/extensions/api/tabs/tabs_test.cc
index e0afb58840954649113d3cd75a68b787d607b47b..e8e64fab3e5847b655fc39b38f5d82c4957192f9 100644
--- a/chrome/browser/extensions/api/tabs/tabs_test.cc
+++ b/chrome/browser/extensions/api/tabs/tabs_test.cc
@@ -2147,7 +2147,7 @@ IN_PROC_BROWSER_TEST_F(ExtensionApiTest, TemporaryAddressSpoof) {
 
 // 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"));