Split up ios/web:test_support.

ios/chrome/browser/metrics/external_url_tab_usage_recorder_egtest.mm

 // Copyright 2017 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.
 
 #import <EarlGrey/EarlGrey.h>
 
 #import "ios/chrome/browser/metrics/tab_usage_recorder.h"
 #import "ios/chrome/browser/metrics/tab_usage_recorder_test_util.h"
 #import "ios/chrome/test/app/histogram_test_util.h"
 #import "ios/chrome/test/app/tab_test_util.h"
 #import "ios/chrome/test/earl_grey/chrome_earl_grey.h"
 #import "ios/chrome/test/earl_grey/chrome_test_case.h"
-#include "ios/web/public/test/http_server_util.h"
+#include "ios/web/public/test/http_server/http_server_util.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 
 const char kTestUrl[] =
     "http://ios/testing/data/http_server_files/memory_usage.html";
 
@@ skipping 28 matching lines @@
   histogramTester.ExpectUniqueSample(kEvictedTabReloadSuccessRate,
                                      TabUsageRecorder::LOAD_FAILURE, 1,
                                      failureBlock);
   histogramTester.ExpectUniqueSample(kDidUserWaitForEvictedTabReload,
                                      TabUsageRecorder::USER_WAITED, 1,
                                      failureBlock);
   histogramTester.ExpectTotalCount(kEvictedTabReloadTime, 0, failureBlock);
 }
 
 @end