Replace some hard coded schemes with the constants in /url/url_constants.h.

content/child/site_isolation_policy.cc

 // Copyright 2013 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 "content/child/site_isolation_policy.h"
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
@@ skipping 315 matching lines @@
     return SiteIsolationResponseMetaData::XML;
   }
 
  return SiteIsolationResponseMetaData::Others;
 }
 
 bool SiteIsolationPolicy::IsBlockableScheme(const GURL& url) {
   // We exclude ftp:// from here. FTP doesn't provide a Content-Type
   // header which our policy depends on, so we cannot protect any
   // document from FTP servers.
-  return url.SchemeIs("http") || url.SchemeIs("https");
+  return url.SchemeIs(url::kHttpScheme) || url.SchemeIs(url::kHttpsScheme);
 }
 
 bool SiteIsolationPolicy::IsSameSite(const GURL& frame_origin,
                                      const GURL& response_url) {
 
   if (!frame_origin.is_valid() || !response_url.is_valid())
     return false;
 
   if (frame_origin.scheme() != response_url.scheme())
     return false;
@@ skipping 157 matching lines @@
   // TODO(dsjang): This is a real hack. The only purpose of this function is to
   // try to see if there's any possibility that this data can be JavaScript
   // (superset of JS). This function will be removed once UMA stats are
   // gathered.
 
   // Search for "var " for JS detection.
   return data.find("var ") != base::StringPiece::npos;
 }
 
 }  // namespace content