Initialize SubstringSetMatcher on construction

chrome/browser/extensions/api/declarative/substring_set_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 "chrome/browser/extensions/api/declarative/substring_set_matcher.h"
 
 #include <queue>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 13 matching lines @@
 bool SubstringPattern::operator<(const SubstringPattern& rhs) const {
   if (id_ < rhs.id_) return true;
   if (id_ > rhs.id_) return false;
   return pattern_ < rhs.pattern_;
 }
 
 //
 // SubstringSetMatcher
 //
 
-SubstringSetMatcher::SubstringSetMatcher() {}
+SubstringSetMatcher::SubstringSetMatcher() {
+  RebuildAhoCorasickTree();
+}
 
 SubstringSetMatcher::~SubstringSetMatcher() {}
 
 void SubstringSetMatcher::RegisterPatterns(
     const std::vector<const SubstringPattern*>& patterns) {
   RegisterAndUnregisterPatterns(patterns,
                                 std::vector<const SubstringPattern*>());
 }
 
 void SubstringSetMatcher::UnregisterPatterns(
@@ skipping 163 matching lines @@
 void SubstringSetMatcher::AhoCorasickNode::AddMatch(SubstringPattern::ID id) {
   matches_.insert(id);
 }
 
 void SubstringSetMatcher::AhoCorasickNode::AddMatches(
     const SubstringSetMatcher::AhoCorasickNode::Matches& matches) {
   matches_.insert(matches.begin(), matches.end());
 }
 
 }  // namespace extensions