Remove legacy StartsWithASCII function.

remoting/host/it2me/it2me_native_messaging_host.cc

Index: remoting/host/it2me/it2me_native_messaging_host.cc
diff --git a/remoting/host/it2me/it2me_native_messaging_host.cc b/remoting/host/it2me/it2me_native_messaging_host.cc
index ddd58d39cdbb9c0579644368e3fbba27b575f465..1bf175ecda500dbf33a96b693631d76230e145dd 100644
--- a/remoting/host/it2me/it2me_native_messaging_host.cc
+++ b/remoting/host/it2me/it2me_native_messaging_host.cc
@@ -168,8 +168,8 @@ void It2MeNativeMessagingHost::ProcessConnect(
   // the authServiceWithToken field. But auth service part is always expected to
   // be set to oauth2.
   const char kOAuth2ServicePrefix[] = "oauth2:";
-  if (!base::StartsWithASCII(auth_service_with_token, kOAuth2ServicePrefix,
-                             true)) {
+  if (!base::StartsWith(auth_service_with_token, kOAuth2ServicePrefix,
+                        base::CompareCase::SENSITIVE)) {
     SendErrorAndExit(response.Pass(), "Invalid 'authServiceWithToken': " +
                                           auth_service_with_token);
     return;