Cleanup by removing thread hop resource throttle code; experiment's over.

chrome/browser/renderer_host/thread_hop_resource_throttle.cc

-// Copyright 2015 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/renderer_host/thread_hop_resource_throttle.h"
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/location.h"
-#include "base/metrics/field_trial.h"
-#include "base/metrics/histogram_macros.h"
-#include "base/strings/string_util.h"
-#include "base/time/time.h"
-#include "content/public/browser/browser_thread.h"
-#include "content/public/browser/resource_controller.h"
-
-ThreadHopResourceThrottle::ThreadHopResourceThrottle() : weak_factory_(this) {}
-
-ThreadHopResourceThrottle::~ThreadHopResourceThrottle() {}
-
-bool ThreadHopResourceThrottle::IsEnabled() {
-  const std::string group_name =
-      base::FieldTrialList::FindFullName("ThreadHopResourceThrottle");
-  return base::StartsWith(group_name, "Enabled", base::CompareCase::SENSITIVE);
-}
-
-void ThreadHopResourceThrottle::WillStartRequest(bool* defer) {
-  *defer = true;
-  ResumeAfterThreadHop();
-}
-
-void ThreadHopResourceThrottle::WillRedirectRequest(
-    const net::RedirectInfo& redirect_info,
-    bool* defer) {
-  *defer = true;
-  ResumeAfterThreadHop();
-}
-
-void ThreadHopResourceThrottle::WillProcessResponse(bool* defer) {
-  *defer = true;
-  ResumeAfterThreadHop();
-}
-
-const char* ThreadHopResourceThrottle::GetNameForLogging() const {
-  return "ThreadHopResourceThrottle";
-}
-
-void ThreadHopResourceThrottle::ResumeAfterThreadHop() {
-  content::BrowserThread::PostTaskAndReply(
-      content::BrowserThread::UI, FROM_HERE, base::Bind(&base::DoNothing),
-      base::Bind(&ThreadHopResourceThrottle::Resume, weak_factory_.GetWeakPtr(),
-                 base::TimeTicks::Now()));
-}
-
-void ThreadHopResourceThrottle::Resume(const base::TimeTicks& time) {
-  UMA_HISTOGRAM_TIMES("Net.ThreadHopResourceThrottleTime",
-                      base::TimeTicks::Now() - time);
-  controller()->Resume();
-}