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

chrome/browser/extensions/api/messaging/native_messaging_host_manifest.cc

 // Copyright (c) 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/extensions/api/messaging/native_messaging_host_manifest.h"
 
 #include <stddef.h>
 
 #include "base/json/json_file_value_serializer.h"
 #include "base/logging.h"
+#include "base/strings/string_util.h"
 #include "base/values.h"
 
 namespace extensions {
 
 NativeMessagingHostManifest::~NativeMessagingHostManifest() {}
 
 // static
 bool NativeMessagingHostManifest::IsValidName(const std::string& name) {
   if (name.empty()) {
     return false;
   }
 
   for (size_t i = 0; i < name.size(); ++i) {
     char c = name[i];
 
     // Verify that only the following characters are used: [a-z0-9._].
-    if (!((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') ||
-          c == '.' || c == '_')) {
+    if (!(base::IsAsciiLower(c) || base::IsAsciiDigit(c) || c == '.' ||
+          c == '_')) {
       return false;
     }
 
     // Verify that dots are separated by other characters and that string
     // doesn't begin or end with a dot.
     if (c == '.' && (i == 0 || name[i - 1] == '.' || i == name.size() - 1)) {
       return false;
     }
   }
 
@@ skipping 92 matching lines @@
       return false;
     }
 
     allowed_origins_.AddPattern(pattern);
   }
 
   return true;
 }
 
 }  // namespace extensions