Add prefetch support to AffiliationBackend.

components/password_manager/core/browser/affiliation_utils.cc

Index: components/password_manager/core/browser/affiliation_utils.cc
diff --git a/components/password_manager/core/browser/affiliation_utils.cc b/components/password_manager/core/browser/affiliation_utils.cc
index 1d359ef110ea51ba16fb15be9cb847c224fde2b0..ee1d9b06f6846fa25c94104bc3bbd93c62fbcd68 100644
--- a/components/password_manager/core/browser/affiliation_utils.cc
+++ b/components/password_manager/core/browser/affiliation_utils.cc
@@ -209,26 +209,26 @@ FacetURI FacetURI::FromCanonicalSpec(const std::string& canonical_spec) {
 }
 
 bool FacetURI::operator==(const FacetURI& other) const {
-  DCHECK(is_valid_);
-  DCHECK(other.is_valid_);
+  DCHECK(is_empty() || is_valid());
+  DCHECK(other.is_empty() || other.is_valid());
   return canonical_spec_ == other.canonical_spec_;
 }
 
 bool FacetURI::operator!=(const FacetURI& other) const {
-  DCHECK(is_valid_);
-  DCHECK(other.is_valid_);
+  DCHECK(is_empty() || is_valid());
+  DCHECK(other.is_empty() || other.is_valid());
   return canonical_spec_ != other.canonical_spec_;
 }
 
 bool FacetURI::operator<(const FacetURI& other) const {
-  DCHECK(is_valid_);
-  DCHECK(other.is_valid_);
+  DCHECK(is_empty() || is_valid());
+  DCHECK(other.is_empty() || other.is_valid());
   return canonical_spec_ < other.canonical_spec_;
 }
 
 bool FacetURI::operator>(const FacetURI& other) const {
-  DCHECK(is_valid_);
-  DCHECK(other.is_valid_);
+  DCHECK(is_empty() || is_valid());
+  DCHECK(other.is_empty() || other.is_valid());
   return canonical_spec_ > other.canonical_spec_;
 }