Consolidate scheme checks into an easy GURL method

net/base/mime_sniffer.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.
 
 // Detecting mime types is a tricky business because we need to balance
 // compatibility concerns with security issues.  Here is a survey of how other
 // browsers behave and then a description of how we intend to behave.
 //
 // HTML payload, no Content-Type header:
 // * IE 7: Render as HTML
@@ skipping 786 matching lines @@
   return true;
 }
 
 bool ShouldSniffMimeType(const GURL& url, const std::string& mime_type) {
   static base::HistogramBase* should_sniff_counter(NULL);
   if (!should_sniff_counter) {
     should_sniff_counter =
         UMASnifferHistogramGet("mime_sniffer.ShouldSniffMimeType2", 3);
   }
   bool sniffable_scheme = url.is_empty() ||
-                          url.SchemeIs("http") ||
-                          url.SchemeIs("https") ||
+                          url.SchemeIsHttp() ||
                           url.SchemeIs("ftp") ||
 #if defined(OS_ANDROID)
                           url.SchemeIs("content") ||
 #endif
                           url.SchemeIsFile() ||
                           url.SchemeIsFileSystem();
   if (!sniffable_scheme) {
     should_sniff_counter->Add(1);
     return false;
   }
@@ skipping 143 matching lines @@
   // First check the extra table.
   if (CheckForMagicNumbers(content, size, kExtraMagicNumbers,
                            arraysize(kExtraMagicNumbers), NULL, result))
     return true;
   // Finally check the original table.
   return CheckForMagicNumbers(content, size, kMagicNumbers,
                               arraysize(kMagicNumbers), NULL, result);
 }
 
 }  // namespace net