Fix IsolatedPrerender misnamed canary check

Bug: 1134643
Change-Id: Ia5fb8a67ae27436b8ec6bf6bbb5dd051944d3a83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446197Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813321}

chrome/browser/prerender/isolated/isolated_prerender_browsertest.cc

@@ -2335,10 +2335,17 @@ IN_PROC_BROWSER_TEST_F(
 IN_PROC_BROWSER_TEST_F(
     ProbingEnabled_CanaryOn_TLSCanaryGood_DNSCanaryBad_IsolatedPrerenderBrowserTest,
     DISABLE_ON_WIN_MAC_CHROMEOS(DNSProbeOK)) {
+  base::HistogramTester histogram_tester;
+
   RunProbeTest(/*probe_success=*/true,
                /*expect_successful_tls_probe=*/false,
                /*expected_status=*/1,
                /*expect_probe=*/true);
+
+  histogram_tester.ExpectTotalCount(
+      "Availability.Prober.FinalState.IsolatedPrerenderDNSCanaryCheck", 1);
+  histogram_tester.ExpectTotalCount(
+      "Availability.Prober.FinalState.IsolatedPrerenderTLSCanaryCheck", 1);
 }
 
 IN_PROC_BROWSER_TEST_F(
@@ -2353,10 +2360,17 @@ IN_PROC_BROWSER_TEST_F(
 IN_PROC_BROWSER_TEST_F(
     ProbingEnabled_CanaryOn_TLSCanaryBad_DNSCanaryBad_IsolatedPrerenderBrowserTest,
     DISABLE_ON_WIN_MAC_CHROMEOS(TLSProbeOK)) {
+  base::HistogramTester histogram_tester;
+
   RunProbeTest(/*probe_success=*/true,
                /*expect_successful_tls_probe=*/true,
                /*expected_status=*/1,
                /*expect_probe=*/true);
+
+  histogram_tester.ExpectTotalCount(
+      "Availability.Prober.FinalState.IsolatedPrerenderDNSCanaryCheck", 1);
+  histogram_tester.ExpectTotalCount(
+      "Availability.Prober.FinalState.IsolatedPrerenderTLSCanaryCheck", 1);
 }
 
 IN_PROC_BROWSER_TEST_F(

chrome/browser/prerender/isolated/isolated_prerender_origin_prober.cc

@@ -297,7 +297,7 @@ IsolatedPrerenderOriginProber::IsolatedPrerenderOriginProber(Profile* profile)
       content::BrowserContext::GetDefaultStoragePartition(profile_)
           ->GetURLLoaderFactoryForBrowserProcess(),
       profile_->GetPrefs(),
-      AvailabilityProber::ClientName::kIsolatedPrerenderTLSCanaryCheck,
+      AvailabilityProber::ClientName::kIsolatedPrerenderDNSCanaryCheck,
       IsolatedPrerenderDNSCanaryCheckURL(),
       AvailabilityProber::HttpMethod::kGet, net::HttpRequestHeaders(),
       retry_policy, timeout_policy, traffic_annotation,