Provide a mechanism to the decl. WebRequest API to match URLs without the query against a RegEx

extensions/common/matcher/regex_set_matcher.h

Index: extensions/common/matcher/regex_set_matcher.h
diff --git a/extensions/common/matcher/regex_set_matcher.h b/extensions/common/matcher/regex_set_matcher.h
index 8d9de1c8c0f5213512bfb431f828a3197f4b182e..906ab9ca3eeb30dc95f97124ea33b41a31869668 100644
--- a/extensions/common/matcher/regex_set_matcher.h
+++ b/extensions/common/matcher/regex_set_matcher.h
@@ -43,6 +43,8 @@ class RegexSetMatcher {
   bool Match(const std::string& text,
              std::set<StringPattern::ID>* matches) const;
 
+  bool IsEmpty() const;
+
  private:
   typedef int RE2ID;
   typedef std::map<StringPattern::ID, const StringPattern*> RegexMap;