[Sheriff] Disable flaky test LocalNTPJavascriptTest.CustomizeMenuTests

Bug: 1038385
Change-Id: I84d247afc580a40417753241d34aa801e2058dab
NoTry: True
Tbr: kristipark@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1981843Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727799}

chrome/browser/ui/search/local_ntp_js_browsertest.cc

@@ -80,8 +80,9 @@ IN_PROC_BROWSER_TEST_F(LocalNTPJavascriptTest, CustomBackgroundsTests) {
   EXPECT_TRUE(success);
 }
 
+// TODO(crbug.com/1038385): This test is flaky.
 // This runs a bunch of pure JS-side tests for the richer picker.
-IN_PROC_BROWSER_TEST_F(LocalNTPJavascriptTest, CustomizeMenuTests) {
+IN_PROC_BROWSER_TEST_F(LocalNTPJavascriptTest, DISABLED_CustomizeMenuTests) {
   content::WebContents* active_tab = local_ntp_test_utils::OpenNewTab(
       browser(), GURL(chrome::kChromeUINewTabURL));
   ASSERT_TRUE(search::IsInstantNTP(active_tab));