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

chrome/browser/spellchecker/feedback_sender.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.
 //
 // The |FeedbackSender| object stores the user feedback to spellcheck
 // suggestions in a |Feedback| object.
 //
 // When spelling service returns spellcheck results, these results first arrive
 // in |FeedbackSender| to assign hash identifiers for each
 // misspelling-suggestion pair. If the spelling service identifies the same
@@ skipping 327 matching lines @@
        !it.IsAtEnd();
        it.Advance()) {
     alive_renderers.insert(it.GetCurrentValue()->GetID());
     it.GetCurrentValue()->Send(new SpellCheckMsg_RequestDocumentMarkers());
   }
 
   // Asynchronously send out the feedback for all the renderers that are no
   // longer alive.
   std::vector<int> known_renderers = feedback_.GetRendersWithMisspellings();
   std::sort(known_renderers.begin(), known_renderers.end());
-  std::vector<int> dead_renderers;
-  std::set_difference(known_renderers.begin(),
-                      known_renderers.end(),
-                      alive_renderers.begin(),
-                      alive_renderers.end(),
-                      std::back_inserter(dead_renderers));
+  std::vector<int> dead_renderers =
+      base::STLSetDifference<std::vector<int> >(known_renderers,
+                                                alive_renderers);
   for (std::vector<int>::const_iterator it = dead_renderers.begin();
        it != dead_renderers.end();
        ++it) {
     base::MessageLoop::current()->PostTask(
         FROM_HERE,
         base::Bind(&FeedbackSender::OnReceiveDocumentMarkers,
                    AsWeakPtr(),
                    *it,
                    std::vector<uint32>()));
   }
@@ skipping 30 matching lines @@
   senders_.push_back(sender);
 
   // Request context is NULL in testing.
   if (request_context_.get()) {
     sender->SetRequestContext(request_context_.get());
     sender->Start();
   }
 }
 
 }  // namespace spellcheck