Remove stl_util's deletion function use from components/url_matcher/.

components/url_matcher/url_matcher.h

Index: components/url_matcher/url_matcher.h
diff --git a/components/url_matcher/url_matcher.h b/components/url_matcher/url_matcher.h
index 0e92547928882012eb846782019dd8e5ba8d6168..adc4ee65d06a4bbbe7f835021c31a46527a071a5 100644
--- a/components/url_matcher/url_matcher.h
+++ b/components/url_matcher/url_matcher.h
@@ -215,8 +215,9 @@ class URL_MATCHER_EXPORT URLMatcherConditionFactory {
   };
   // Set to ensure that we generate only one StringPattern for each content
   // of StringPattern::pattern().
-  typedef std::set<StringPattern*, StringPatternPointerCompare>
-      PatternSingletons;
+  using PatternSingletons = std::map<StringPattern*,
+                                     std::unique_ptr<StringPattern>,
+                                     StringPatternPointerCompare>;
   PatternSingletons substring_pattern_singletons_;
   PatternSingletons regex_pattern_singletons_;
   PatternSingletons origin_and_path_regex_pattern_singletons_;