Delete obsolete prerender experiment code

chrome/browser/prerender/prerender_contents.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 "chrome/browser/prerender/prerender_contents.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <functional>
@@ skipping 255 matching lines @@
   DCHECK(!prerendering_has_started_);
   DCHECK(!prerender_contents_);
   DCHECK_EQ(1U, alias_urls_.size());
 
   session_storage_namespace_id_ = session_storage_namespace->id();
   bounds_ = bounds;
 
   DCHECK(load_start_time_.is_null());
   load_start_time_ = base::TimeTicks::Now();
 
-  // Everything after this point sets up the WebContents object and associated
-  // RenderView for the prerender page. Don't do this for members of the
-  // control group.
-  if (prerender_manager_->IsControlGroup())
-    return;
-
   prerendering_has_started_ = true;
 
   prerender_contents_.reset(CreateWebContents(session_storage_namespace));
   TabHelpers::AttachTabHelpers(prerender_contents_.get());
   content::WebContentsObserver::Observe(prerender_contents_.get());
 
   // Tag the prerender contents with the task manager specific prerender tag, so
   // that it shows up in the task manager.
   task_manager::WebContentsTags::CreateForPrerenderContents(
       prerender_contents_.get());
@@ skipping 336 matching lines @@
 
   if (prerendering_has_been_cancelled_)
     return;
 
   SetFinalStatus(final_status);
 
   prerendering_has_been_cancelled_ = true;
   prerender_manager_->AddToHistory(this);
   prerender_manager_->MoveEntryToPendingDelete(this, final_status);
 
-  if (!prerender_manager_->IsControlGroup() && prerendering_has_started())
+  if (prerendering_has_started())
     NotifyPrerenderStop();
 }
 
 base::ProcessMetrics* PrerenderContents::MaybeGetProcessMetrics() {
   if (!process_metrics_) {
     // If a PrenderContents hasn't started prerending, don't be fully formed.
     const RenderViewHost* rvh = GetRenderViewHost();
     if (!rvh)
       return nullptr;
 
@@ skipping 102 matching lines @@
 void PrerenderContents::AddResourceThrottle(
     const base::WeakPtr<PrerenderResourceThrottle>& throttle) {
   resource_throttles_.push_back(throttle);
 }
 
 void PrerenderContents::AddNetworkBytes(int64_t bytes) {
   network_bytes_ += bytes;
 }
 
 }  // namespace prerender