Implement IsAsciiUpper and IsAsciiLower in base/strings/string_util.h

url/url_canon_fileurl.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.
 
 // Functions for canonicalizing "file:" URLs.
 
+#include "base/strings/string_util.h"
 #include "url/url_canon.h"
 #include "url/url_canon_internal.h"
 #include "url/url_file.h"
 #include "url/url_parse_internal.h"
 
 namespace url {
 
 namespace {
 
 #ifdef WIN32
@@ skipping 15 matching lines @@
     return begin;  // Haven't consumed any characters
 
   // A drive spec is the start of a path, so we need to add a slash for the
   // authority terminator (typically the third slash).
   output->push_back('/');
 
   // DoesBeginWindowsDriveSpec will ensure that the drive letter is valid
   // and that it is followed by a colon/pipe.
 
   // Normalize Windows drive letters to uppercase
-  if (spec[after_slashes] >= 'a' && spec[after_slashes] <= 'z')
+  if (base::IsAsciiLower(spec[after_slashes]))
     output->push_back(static_cast<char>(spec[after_slashes] - 'a' + 'A'));
   else
     output->push_back(static_cast<char>(spec[after_slashes]));
 
   // Normalize the character following it to a colon rather than pipe.
   output->push_back(':');
   return after_slashes + 2;
 }
 
 #endif  // WIN32
@@ skipping 127 matching lines @@
                     Parsed* new_parsed) {
   RawCanonOutput<1024> utf8;
   URLComponentSource<char> source(base);
   Parsed parsed(base_parsed);
   SetupUTF16OverrideComponents(base, replacements, &utf8, &source, &parsed);
   return DoCanonicalizeFileURL<char, unsigned char>(
       source, parsed, query_converter, output, new_parsed);
 }
 
 }  // namespace url