Move StringToLowerASCII to base namespace

components/url_matcher/regex_set_matcher.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 "components/url_matcher/regex_set_matcher.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "components/url_matcher/substring_set_matcher.h"
@@ skipping 30 matching lines @@
   if (regexes_.empty())
     return false;
   if (!filtered_re2_.get()) {
     LOG(ERROR) << "RegexSetMatcher was not initialized";
     return false;
   }
 
   // FilteredRE2 expects lowercase for prefiltering, but we still
   // match case-sensitively.
   std::vector<RE2ID> atoms(FindSubstringMatches(
-      StringToLowerASCII(text)));
+      base::StringToLowerASCII(text)));
 
   std::vector<RE2ID> re2_ids;
   filtered_re2_->AllMatches(text, atoms, &re2_ids);
 
   for (size_t i = 0; i < re2_ids.size(); ++i) {
     StringPattern::ID id = re2_id_map_[re2_ids[i]];
     matches->insert(id);
   }
   return old_number_of_matches != matches->size();
 }
@@ skipping 42 matching lines @@
         new StringPattern(strings_to_match[i], i));
   }
   substring_matcher_->RegisterPatterns(substring_patterns_);
 }
 
 void RegexSetMatcher::DeleteSubstringPatterns() {
   STLDeleteElements(&substring_patterns_);
 }
 
 }  // namespace url_matcher