Implement rules removal for WebRequestRulesRegistry

chrome/browser/extensions/api/declarative/url_matcher_unittest.cc

Index: chrome/browser/extensions/api/declarative/url_matcher_unittest.cc
diff --git a/chrome/browser/extensions/api/declarative/url_matcher_unittest.cc b/chrome/browser/extensions/api/declarative/url_matcher_unittest.cc
index 082d3ccc838351aee165d102cd298909ec284fd6..5d0839af9eb7da817a6e69c8a9644fd292348575 100644
--- a/chrome/browser/extensions/api/declarative/url_matcher_unittest.cc
+++ b/chrome/browser/extensions/api/declarative/url_matcher_unittest.cc
@@ -152,6 +152,7 @@ TEST(URLMatcherConditionFactoryTest, TestSingletonProperty) {
   // ForgetUnusedPatterns.
   SubstringPattern::ID old_id_1 = c1.substring_pattern()->id();
   factory.ForgetUnusedPatterns(std::set<SubstringPattern::ID>());
+  EXPECT_TRUE(factory.IsEmpty());
   URLMatcherCondition c4 = factory.CreateHostEqualsCondition("www.google.com");
   EXPECT_NE(old_id_1, c4.substring_pattern()->id());
 }
@@ -386,6 +387,8 @@ TEST(URLMatcherTest, FullTest) {
   EXPECT_EQ(0u, matcher.MatchURL(url1).size());
   EXPECT_EQ(0u, matcher.MatchURL(url2).size());
 
+  EXPECT_TRUE(matcher.IsEmpty());
+
   // The cached singleton in matcher.condition_factory_ should be destroyed to
   // free memory.
   int patternId2 = factory->CreateHostSuffixCondition(