Remove unused param in EventFilter::CreateConditionSets.

extensions/common/event_filter.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/event_filter.h"
 
 #include <string>
 #include <utility>
 
 #include "base/memory/ptr_util.h"
@@ skipping 39 matching lines @@
     for (EventMatcherMap::iterator it2 = it->second.begin();
          it2 != it->second.end(); it2++) {
       it2->second->DontRemoveConditionSetsInDestructor();
     }
   }
 }
 
 EventFilter::MatcherID EventFilter::AddEventMatcher(
     const std::string& event_name,
     std::unique_ptr<EventMatcher> matcher) {
-  MatcherID id = next_id_++;
   URLMatcherConditionSet::Vector condition_sets;
-  if (!CreateConditionSets(id, matcher.get(), &condition_sets))
+  if (!CreateConditionSets(matcher.get(), &condition_sets))
     return -1;
 
+  MatcherID id = next_id_++;
   for (URLMatcherConditionSet::Vector::iterator it = condition_sets.begin();
        it != condition_sets.end(); it++) {
     condition_set_id_to_event_matcher_id_.insert(
         std::make_pair((*it)->id(), id));
   }
   id_to_event_name_[id] = event_name;
   event_matchers_[event_name][id] = base::MakeUnique<EventMatcherEntry>(
       std::move(matcher), &url_matcher_, condition_sets);
   return id;
 }
 
 EventMatcher* EventFilter::GetEventMatcher(MatcherID id) {
   DCHECK(id_to_event_name_.find(id) != id_to_event_name_.end());
   const std::string& event_name = id_to_event_name_[id];
   return event_matchers_[event_name][id]->event_matcher();
 }
 
 const std::string& EventFilter::GetEventName(MatcherID id) {
   DCHECK(id_to_event_name_.find(id) != id_to_event_name_.end());
   return id_to_event_name_[id];
 }
 
 bool EventFilter::CreateConditionSets(
-    MatcherID id,

[lazyboy, 2017/02/15 23:59:00]

Note: from git log, this was unused since it was introduced
https://chromiumcodereview.appspot.com/10388135/diff/15001/chrome/common/exte...

     EventMatcher* matcher,
     URLMatcherConditionSet::Vector* condition_sets) {
   if (matcher->GetURLFilterCount() == 0) {
     // If there are no URL filters then we want to match all events, so create a
     // URLFilter from an empty dictionary.
     base::DictionaryValue empty_dict;
     return AddDictionaryAsConditionSet(&empty_dict, condition_sets);
   }
   for (int i = 0; i < matcher->GetURLFilterCount(); i++) {
     base::DictionaryValue* url_filter;
@@ skipping 80 matching lines @@
 
 int EventFilter::GetMatcherCountForEvent(const std::string& name) {
   EventMatcherMultiMap::const_iterator it = event_matchers_.find(name);
   if (it == event_matchers_.end())
     return 0;
 
   return it->second.size();
 }
 
 }  // namespace extensions