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

content/renderer/pepper/url_request_info_util.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.
 
 #include "content/renderer/pepper/url_request_info_util.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
@@ skipping 95 matching lines @@
   return true;
 }
 
 std::string FilterStringForXRequestedWithValue(const std::string& s) {
   std::string rv;
   rv.reserve(s.length());
   for (size_t i = 0; i < s.length(); i++) {
     char c = s[i];
     // Allow ASCII digits, letters, periods, commas, and underscores. (Ignore
     // all other characters.)
-    if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') ||
-        (c >= 'a' && c <= 'z') || (c == '.') || (c == ',') || (c == '_'))
+    if (base::IsAsciiDigit(c) || base::IsAsciiAlpha(c) || (c == '.') ||
+        (c == ',') || (c == '_'))
       rv.push_back(c);
   }
   return rv;
 }
 
 // Returns an appropriate value for the X-Requested-With header for plugins that
 // present an X-Requested-With header. Returns a blank string for other plugins.
 // We produce a user-agent-like string (eating spaces and other undesired
 // characters) like "ShockwaveFlash/11.5.31.135" from the plugin name and
 // version.
@@ skipping 113 matching lines @@
 }
 
 bool URLRequestRequiresUniversalAccess(const URLRequestInfoData& data) {
   return data.has_custom_referrer_url ||
          data.has_custom_content_transfer_encoding ||
          data.has_custom_user_agent ||
          url::FindAndCompareScheme(data.url, url::kJavaScriptScheme, NULL);
 }
 
 }  // namespace content