Disabled a few more failing perf tests

ios/chrome/browser/ui/ntp/new_tab_page_perftest.mm

 // Copyright 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.
 
 #import "base/test/ios/wait_util.h"
 #include "ios/chrome/browser/sessions/ios_chrome_tab_restore_service_factory.h"
 #import "ios/chrome/browser/tabs/tab_model.h"
 #include "ios/chrome/browser/test/perf_test_with_bvc_ios.h"
 #import "ios/chrome/browser/ui/browser_view_controller.h"
 #import "ios/chrome/browser/ui/browser_view_controller_dependency_factory.h"
@@ skipping 32 matching lines @@
   void SettleUI() {
     base::test::ios::WaitUntilCondition(
         nil, false, base::TimeDelta::FromSecondsD(kMaxUICatchupDelay));
   }
 };
 
 // Output format first test:
 // [*]RESULT NTP - Create: NTP Gentle Create First Tab= number ms
 // Output format subsequent average:
 // [*]RESULT NTP - Create: NTP Gentle Create= number ms
-TEST_F(NewTabPagePerfTest, OpenNTP_Gentle) {
+// TODO(crbug.com/717314): Failed DCHECK in PerfTestWithBVC::SetUp().
+TEST_F(NewTabPagePerfTest, DISABLED_OpenNTP_Gentle) {
   RepeatTimedRuns("NTP Gentle Create",
                   ^(int index) {
                     return TimedNewTab();
                   },
                   ^{
                     SettleUI();
                   });
 }
 
 // Output format first test:
 // [*]RESULT NTP - Create: NTP Hammer Create First Tab= number ms
 // Output format subsequent average:
 // [*]RESULT NTP - Create: NTP Hammer Create= number ms
-TEST_F(NewTabPagePerfTest, OpenNTP_Hammer) {
+// TODO(crbug.com/717314): Failed DCHECK in PerfTestWithBVC::SetUp().
+TEST_F(NewTabPagePerfTest, DISABLED_OpenNTP_Hammer) {
   RepeatTimedRuns("NTP Hammer Create",
                   ^(int index) {
                     return TimedNewTab();
                   },
                   nil);
   // Allows the run loops to run before teardown.
   SettleUI();
 }
 
 }  // anonymous namespace