Delete obsolete prerender experiment code

chrome/browser/prerender/prerender_browsertest.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 <stddef.h>
 #include <deque>
 #include <set>
 #include <string>
 #include <unordered_map>
 #include <utility>
@@ skipping 2552 matching lines @@
 // Validate that the sessionStorage namespace remains the same when swapping
 // in a prerendered page.
 IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, PrerenderSessionStorage) {
   set_loader_path("/prerender/prerender_loader_with_session_storage.html");
   PrerenderTestURL(GetCrossDomainTestUrl("prerender/prerender_page.html"),
                    FINAL_STATUS_USED, 1);
   NavigateToDestURL();
   GoBackToPageBeforePrerender();
 }
 
-// Checks that the control group works.  An XHR PUT cannot be detected in the
-// control group.
-IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, ControlGroup) {
-  RestorePrerenderMode restore_prerender_mode;
-  PrerenderManager::SetMode(
-      PrerenderManager::PRERENDER_MODE_EXPERIMENT_CONTROL_GROUP);
-  DisableJavascriptCalls();
-  PrerenderTestURL("/prerender/prerender_xhr_put.html",
-                   FINAL_STATUS_WOULD_HAVE_BEEN_USED, 0);
-  NavigateToDestURL();
-}
-
-// Checks that the control group correctly hits WOULD_HAVE_BEEN_USED
-// renderer-initiated navigations. (This verifies that the ShouldFork logic
-// behaves correctly.)
-IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, ControlGroupRendererInitiated) {
-  RestorePrerenderMode restore_prerender_mode;
-  PrerenderManager::SetMode(
-      PrerenderManager::PRERENDER_MODE_EXPERIMENT_CONTROL_GROUP);
-  DisableJavascriptCalls();
-  PrerenderTestURL("/prerender/prerender_xhr_put.html",
-                   FINAL_STATUS_WOULD_HAVE_BEEN_USED, 0);
-  OpenDestURLViaClick();
-}
-
 // Checks that the referrer policy is used when prerendering.
 IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, PrerenderReferrerPolicy) {
   set_loader_path("/prerender/prerender_loader_with_referrer_policy.html");
   PrerenderTestURL("/prerender/prerender_referrer_policy.html",
                    FINAL_STATUS_USED, 1);
   NavigateToDestURL();
 }
 
 // Checks that the referrer policy is used when prerendering on HTTPS.
 IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest,
@@ skipping 739 matching lines @@
       browser()->tab_strip_model()->GetActiveWebContents();
   bool display_test_result = false;
   ASSERT_TRUE(content::ExecuteScriptAndExtractBool(web_contents,
                                                    "DidDisplayReallyPass()",
                                                    &display_test_result));
   ASSERT_TRUE(display_test_result);
 }
 #endif  // !defined(DISABLE_NACL)
 
 }  // namespace prerender