Implement rules removal for WebRequestRulesRegistry

chrome/browser/extensions/api/declarative/url_matcher.h

Index: chrome/browser/extensions/api/declarative/url_matcher.h
diff --git a/chrome/browser/extensions/api/declarative/url_matcher.h b/chrome/browser/extensions/api/declarative/url_matcher.h
index 4ea7f66740757b3c0fd4228f3fc95e31ae954a74..0e163ebe46d15698810ce4503c1113569e9c941a 100644
--- a/chrome/browser/extensions/api/declarative/url_matcher.h
+++ b/chrome/browser/extensions/api/declarative/url_matcher.h
@@ -148,6 +148,9 @@ class URLMatcherConditionFactory {
   void ForgetUnusedPatterns(
       const std::set<SubstringPattern::ID>& used_patterns);
 
+  // Returns true if this object retains no allocated data. Only for debugging.
+  bool IsEmpty() const;
+
  private:
   // Creates a URLMatcherCondition according to the parameters passed.
   // The URLMatcherCondition will refer to a SubstringPattern that is
@@ -233,6 +236,9 @@ class URLMatcher {
     return &condition_factory_;
   }
 
+  // Returns true if this object retains no allocated data. Only for debugging.
+  bool IsEmpty() const;
+
  private:
   void UpdateSubstringSetMatcher(bool full_url_conditions);
   void UpdateTriggers();