Delete obsolete prerender experiment code

chrome/browser/prerender/prerender_unittest.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 <stdint.h>
 
 #include <map>
 #include <utility>
 
@@ skipping 280 matching lines @@
       expected_final_status_(expected_final_status) {}
 
 DummyPrerenderContents::~DummyPrerenderContents() {
   EXPECT_EQ(expected_final_status_, final_status());
   test_prerender_manager_->DummyPrerenderContentsDestroyed(-1, route_id_);
 }
 
 void DummyPrerenderContents::StartPrerendering(
     const gfx::Rect& bounds,
     content::SessionStorageNamespace* session_storage_namespace) {
-  // In the base PrerenderContents implementation, StartPrerendering will
-  // be called even when the PrerenderManager is part of the control group,
-  // but it will early exit before actually creating a new RenderView if
-  // |is_control_group| is true;
   load_start_time_ = test_prerender_manager_->GetCurrentTimeTicks();
-  if (!test_prerender_manager_->IsControlGroup()) {
-    prerendering_has_started_ = true;
-    test_prerender_manager_->DummyPrerenderContentsStarted(-1, route_id_, this);
-    NotifyPrerenderStart();
-  }
+  prerendering_has_started_ = true;
+  test_prerender_manager_->DummyPrerenderContentsStarted(-1, route_id_, this);
+  NotifyPrerenderStart();
 }
 
 class PrerenderTest : public testing::Test {
  public:
   static const int kDefaultChildId = -1;
   static const int kDefaultRenderViewRouteId = -1;
 
   PrerenderTest()
       : ui_thread_(BrowserThread::UI, &message_loop_),
         prerender_manager_(new UnitTestPrerenderManager(&profile_)),
@@ skipping 586 matching lines @@
   // Use the referring prerender.
   EXPECT_TRUE(prerender_contents->prerendering_has_started());
   std::unique_ptr<PrerenderContents> entry =
       prerender_manager()->FindAndUseEntry(url);
   ASSERT_EQ(prerender_contents, entry.get());
 
   // The pending prerender doesn't start.
   EXPECT_FALSE(LauncherHasRunningPrerender(child_id, last_prerender_id()));
 }
 
-// Tests that a PrerenderManager created for a browser session in the control
-// group works as expected.
-TEST_F(PrerenderTest, ControlGroup) {
-  RestorePrerenderMode restore_prerender_mode;
-  PrerenderManager::SetMode(
-      PrerenderManager::PRERENDER_MODE_EXPERIMENT_CONTROL_GROUP);
-  GURL url("http://www.google.com/");
-  DummyPrerenderContents* prerender_contents =
-      prerender_manager()->CreateNextPrerenderContents(
-          url,
-          FINAL_STATUS_MANAGER_SHUTDOWN);
-  EXPECT_TRUE(AddSimplePrerender(url));
-  EXPECT_FALSE(prerender_contents->prerendering_has_started());
-}
-
 // Tests that prerendering is cancelled when the source render view does not
 // exist.  On failure, the DCHECK in CreatePrerenderContents() above should be
 // triggered.
 TEST_F(PrerenderTest, SourceRenderViewClosed) {
   GURL url("http://www.google.com/");
   prerender_manager()->CreateNextPrerenderContents(
       url,
       FINAL_STATUS_MANAGER_SHUTDOWN);
   prerender_link_manager()->OnAddPrerender(
       100, GetNextPrerenderID(), url, kDefaultRelTypes, Referrer(), kSize, 200);
@@ skipping 843 matching lines @@
   prerender_contents->SetPrerenderMode(PREFETCH_ONLY);
   EXPECT_TRUE(prerender_contents->IsValidHttpMethod("GET"));
   EXPECT_TRUE(prerender_contents->IsValidHttpMethod("HEAD"));
   EXPECT_FALSE(prerender_contents->IsValidHttpMethod("OPTIONS"));
   EXPECT_FALSE(prerender_contents->IsValidHttpMethod("POST"));
   EXPECT_FALSE(prerender_contents->IsValidHttpMethod("TRACE"));
   EXPECT_FALSE(prerender_contents->IsValidHttpMethod("WHATEVER"));
 }
 
 }  // namespace prerender