[NoStatePrefetch] Remove obsolete histograms

chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc

Index: chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc
diff --git a/chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc b/chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc
index 69d7fb1f345c7bb17857366e9b996b84914ab639..65551c02de58d59c99c39ad334468b006e804518 100644
--- a/chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc
+++ b/chrome/browser/prerender/prerender_nostate_prefetch_browsertest.cc
@@ -165,7 +165,7 @@ IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, PrefetchLoadFlag) {
 IN_PROC_BROWSER_TEST_F(NoStatePrefetchBrowserTest, PrefetchHistograms) {
   PrefetchFromFile(kPrefetchPage, FINAL_STATUS_NOSTATE_PREFETCH_FINISHED);
   histogram_tester().ExpectTotalCount(
-      "Prerender.websame_NoStatePrefetchTTFCP.Warm", 0);
+      "Prerender.websame_PrefetchTTFCP.Warm.Cacheable.Visible", 0);
 
   test_utils::FirstContentfulPaintManagerWaiter* fcp_waiter =
       test_utils::FirstContentfulPaintManagerWaiter::Create(