Disabled a few more failing perf tests

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

Index: ios/chrome/browser/ui/ntp/new_tab_page_perftest.mm
diff --git a/ios/chrome/browser/ui/ntp/new_tab_page_perftest.mm b/ios/chrome/browser/ui/ntp/new_tab_page_perftest.mm
index f0fcc20290597f66a07a595b0d327f2b1205deed..5f952fa1f4667925001ffb769c7a39e3a8108d82 100644
--- a/ios/chrome/browser/ui/ntp/new_tab_page_perftest.mm
+++ b/ios/chrome/browser/ui/ntp/new_tab_page_perftest.mm
@@ -50,7 +50,8 @@ class NewTabPagePerfTest : public PerfTestWithBVC {
 // [*]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();
@@ -64,7 +65,8 @@ TEST_F(NewTabPagePerfTest, OpenNTP_Gentle) {
 // [*]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();