[CleanUp] Use base::STLSetDifference in place of std::set_difference

extensions/common/matcher/url_matcher.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 "extensions/common/matcher/url_matcher.h"
 
 #include <algorithm>
 #include <iterator>
 
 #include "base/logging.h"
@@ skipping 734 matching lines @@
     }
   }
 
   // This is the set of patterns that were registered before this function
   // is called.
   std::set<const StringPattern*>& registered_patterns =
       full_url_conditions ? registered_full_url_patterns_
                           : registered_url_component_patterns_;
 
   // Add all patterns that are in new_patterns but not in registered_patterns.
-  std::vector<const StringPattern*> patterns_to_register;
-  std::set_difference(
-      new_patterns.begin(), new_patterns.end(),
-      registered_patterns.begin(), registered_patterns.end(),
-      std::back_inserter(patterns_to_register));
+  std::vector<const StringPattern*> patterns_to_register =
+      base::STLSetDifference<std::vector<const StringPattern*> >(
+          new_patterns, registered_patterns);
 
   // Remove all patterns that are in registered_patterns but not in
   // new_patterns.
-  std::vector<const StringPattern*> patterns_to_unregister;
-  std::set_difference(
-      registered_patterns.begin(), registered_patterns.end(),
-      new_patterns.begin(), new_patterns.end(),
-      std::back_inserter(patterns_to_unregister));
+  std::vector<const StringPattern*> patterns_to_unregister =
+      base::STLSetDifference<std::vector<const StringPattern*> >(
+           registered_patterns, new_patterns);
 
   // Update the SubstringSetMatcher.
   SubstringSetMatcher& url_matcher =
       full_url_conditions ? full_url_matcher_ : url_component_matcher_;
   url_matcher.RegisterAndUnregisterPatterns(patterns_to_register,
                                             patterns_to_unregister);
 
   // Update the set of registered_patterns for the next time this function
   // is being called.
   registered_patterns.swap(new_patterns);
@@ skipping 98 matching lines @@
 
 void URLMatcher::UpdateInternalDatastructures() {
   UpdateSubstringSetMatcher(false);
   UpdateSubstringSetMatcher(true);
   UpdateRegexSetMatcher();
   UpdateTriggers();
   UpdateConditionFactory();
 }
 
 }  // namespace extensions