Make BrowsingDataRemover mockable and filter builders comparable

chrome/browser/browsing_data/registrable_domain_filter_builder.cc

Index: chrome/browser/browsing_data/registrable_domain_filter_builder.cc
diff --git a/chrome/browser/browsing_data/registrable_domain_filter_builder.cc b/chrome/browser/browsing_data/registrable_domain_filter_builder.cc
index a0604834ea0e8dc27d490b4505b30f0262024fce..139b046f7983f020dc8bceddcb5d071c3f61baf0 100644
--- a/chrome/browser/browsing_data/registrable_domain_filter_builder.cc
+++ b/chrome/browser/browsing_data/registrable_domain_filter_builder.cc
@@ -107,6 +107,11 @@ RegistrableDomainFilterBuilder::BuildChannelIDFilter() const {
       base::Owned(domains_and_ips), mode());
 }
 
+bool RegistrableDomainFilterBuilder::operator==(
+    const RegistrableDomainFilterBuilder& other) const {
+  return domain_list_ == other.domain_list_ && mode() == other.mode();
+}
+
 bool RegistrableDomainFilterBuilder::IsEmpty() const {
   return domain_list_.empty();
 }