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

chrome/browser/devtools/devtools_file_system_indexer.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 "chrome/browser/devtools/devtools_file_system_indexer.h"
 
 #include <stddef.h>
 
 #include <iterator>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_util.h"
 #include "base/files/file_util_proxy.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/stl_util.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/browser/browser_thread.h"
 
 using base::Bind;
 using base::Callback;
 using base::FileEnumerator;
 using base::FilePath;
 using base::Time;
 using base::TimeDelta;
 using base::TimeTicks;
@@ skipping 55 matching lines @@
   if (!trigram_chars) {
     trigram_chars = new TrigramChar[256];
     for (size_t i = 0; i < 256; ++i) {
       if (i > 127) {
         trigram_chars[i] = kUndefinedTrigramChar;
         continue;
       }
       char ch = static_cast<char>(i);
       if (ch == '\t')
         ch = ' ';
-      if (ch >= 'A' && ch <= 'Z')
+      if (base::IsAsciiUpper(ch))
         ch = ch - 'A' + 'a';
 
       bool is_binary_char = ch < 9 || (ch >= 14 && ch < 32) || ch == 127;
       if (is_binary_char) {
         trigram_chars[i] = kBinaryTrigramChar;
         continue;
       }
 
       if (ch < ' ') {
         trigram_chars[i] = kUndefinedTrigramChar;
@@ skipping 370 matching lines @@
   vector<FilePath> file_paths = g_trigram_index.Get().Search(query);
   vector<string> result;
   FilePath path = FilePath::FromUTF8Unsafe(file_system_path);
   vector<FilePath>::const_iterator it = file_paths.begin();
   for (; it != file_paths.end(); ++it) {
     if (path.IsParent(*it))
       result.push_back(it->AsUTF8Unsafe());
   }
   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, Bind(callback, result));
 }