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

content/browser/frame_host/frame_tree_browsertest.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 "base/macros.h"
 #include "build/build_config.h"
 #include "content/browser/frame_host/frame_tree.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
@@ skipping 681 matching lines @@
 
   GURL data_url("data:text/html,foo");
   NavigateFrameToURL(root->child_at(1), data_url);
 
   // Navigating to a data URL should set a unique origin.  This is represented
   // as "null" per RFC 6454.
   EXPECT_EQ(root->child_at(1)->current_origin().Serialize(), "null");
 }
 
 // FrameTreeBrowserTest variant where we isolate http://*.is, Iceland's top
-// level domain. This is an analogue to --isolate-extensions that we use inside
-// of content_browsertests, where extensions don't exist. Iceland, like an
+// level domain. This is an analogue to isolating extensions, which we can use
+// inside content_browsertests, where extensions don't exist. Iceland, like an
 // extension process, is a special place with magical powers; we want to protect
 // it from outsiders.
 class IsolateIcelandFrameTreeBrowserTest : public ContentBrowserTest {
  public:
   IsolateIcelandFrameTreeBrowserTest() {}
 
   void SetUpCommandLine(base::CommandLine* command_line) override {
     command_line->AppendSwitchASCII(switches::kIsolateSitesForTesting, "*.is");
   }
 
@@ skipping 41 matching lines @@
   // Make sure we did a process transfer back to "b.is".
   EXPECT_EQ(
       " Site A ------------ proxies for B\n"
       "   +--Site B ------- proxies for A\n"
       "Where A = http://a.com/\n"
       "      B = http://b.is/",
       FrameTreeVisualizer().DepictFrameTree(root));
 }
 
 }  // namespace content