Consolidate scheme checks into an easy GURL method

chrome/browser/metrics/variations/variations_http_header_provider.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/metrics/variations/variations_http_header_provider.h"
 
 #include "base/base64.h"
 #include "base/memory/singleton.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_util.h"
@@ skipping 138 matching lines @@
 }
 
 // static
 bool VariationsHttpHeaderProvider::ShouldAppendHeaders(const GURL& url) {
   if (google_util::IsGoogleDomainUrl(url, google_util::ALLOW_SUBDOMAIN,
                                      google_util::ALLOW_NON_STANDARD_PORTS)) {
     return true;
   }
 
   // The below mirrors logic in IsGoogleDomainUrl(), but for youtube.<TLD>.
-  if (!url.is_valid() || !(url.SchemeIs("http") || url.SchemeIs("https")))
+  if (!url.is_valid() || !url.SchemeIsHTTPOrHTTPS())
     return false;
 
   const std::string host = url.host();
   const size_t tld_length = net::registry_controlled_domains::GetRegistryLength(
       host,
       net::registry_controlled_domains::EXCLUDE_UNKNOWN_REGISTRIES,
       net::registry_controlled_domains::EXCLUDE_PRIVATE_REGISTRIES);
   if ((tld_length == 0) || (tld_length == std::string::npos))
     return false;
 
   const std::string host_minus_tld(host, 0, host.length() - tld_length);
   return LowerCaseEqualsASCII(host_minus_tld, "youtube.") ||
       EndsWith(host_minus_tld, ".youtube.", false);
 }
 
 }  // namespace chrome_variations