Pure pedantry: Replace all ".size() == 0" with ".empty()".

net/tools/tld_cleanup/tld_cleanup.cc

 // Copyright (c) 2006-2008 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.
 
 // This command-line program converts an effective-TLD data file in UTF-8 from
 // the format provided by Mozilla to the format expected by Chrome.  This
 // program generates an intermediate file which is then used by gperf to
 // generate a perfect hash map.  The benefit of this approach is that no time is
 // spent on program initialization to generate the map of this data.
 //
@@ skipping 88 matching lines @@
 // Adjusts the rule to a standard form: removes single extraneous dots and
 // canonicalizes it using GURL. Returns kSuccess if the rule is interpreted as
 // valid; logs a warning and returns kWarning if it is probably invalid; and
 // logs an error and returns kError if the rule is (almost) certainly invalid.
 NormalizeResult NormalizeRule(std::string* domain, Rule* rule) {
   NormalizeResult result = kSuccess;
 
   // Strip single leading and trailing dots.
   if (domain->at(0) == '.')
     domain->erase(0, 1);
-  if (domain->size() == 0) {
+  if (domain->empty()) {
     LOG(WARNING) << "Ignoring empty rule";
     return kWarning;
   }
   if (domain->at(domain->size() - 1) == '.')
     domain->erase(domain->size() - 1, 1);
-  if (domain->size() == 0) {
+  if (domain->empty()) {
     LOG(WARNING) << "Ignoring empty rule";
     return kWarning;
   }
 
   // Allow single leading '*.' or '!', saved here so it's not canonicalized.
   size_t start_offset = 0;
   if (domain->at(0) == '!') {
     domain->erase(0, 1);
     rule->exception = true;
   } else if (domain->find("*.") == 0) {
     domain->erase(0, 2);
     rule->wildcard = true;
   }
-  if (domain->size() == 0) {
+  if (domain->empty()) {
     LOG(WARNING) << "Ignoring empty rule";
     return kWarning;
   }
 
   // Warn about additional '*.' or '!'.
   if (domain->find("*.", start_offset) != std::string::npos ||
       domain->find('!', start_offset) != std::string::npos) {
     LOG(WARNING) << "Keeping probably invalid rule: " << *domain;
     result = kWarning;
   }
@@ skipping 149 matching lines @@
   NormalizeResult result = NormalizeFile(input_file, output_file);
   if (result != kSuccess) {
     fprintf(stderr,
             "Errors or warnings processing file.  See log in tld_cleanup.log.");
   }
 
   if (result == kError)
     return 1;
   return 0;
 }