Update base::StartsWith calls to new form

chrome/browser/net/async_dns_field_trial.cc

Index: chrome/browser/net/async_dns_field_trial.cc
diff --git a/chrome/browser/net/async_dns_field_trial.cc b/chrome/browser/net/async_dns_field_trial.cc
index ab4f704f0c0a9c51cacce9087f604e1ca2373b9c..b8ce85fd4226bfe993f2770be84eb32ae2e70b38 100644
--- a/chrome/browser/net/async_dns_field_trial.cc
+++ b/chrome/browser/net/async_dns_field_trial.cc
@@ -79,8 +79,8 @@ bool ConfigureAsyncDnsFieldTrial() {
   // otherwise (trial absent): return default.
   std::string group_name = base::FieldTrialList::FindFullName("AsyncDns");
   if (!group_name.empty()) {
-    const bool enabled = base::StartsWithASCII(group_name, "AsyncDns",
-                                               false /* case_sensitive */);
+    const bool enabled = base::StartsWith(group_name, "AsyncDns",
+                                          base::CompareCase::INSENSITIVE_ASCII);
     HistogramPrefDefaultSource(FIELD_TRIAL, enabled);
     return enabled;
   }