Use AutofillProfileComparator in place of ad-hoc merge logic.

components/autofill/core/browser/address.h

Index: components/autofill/core/browser/address.h
diff --git a/components/autofill/core/browser/address.h b/components/autofill/core/browser/address.h
index 4f07f0576802fff1648a05ddf548940dea6737bd..a37d485f3441734d1fc0ac3058aba984b118739a 100644
--- a/components/autofill/core/browser/address.h
+++ b/components/autofill/core/browser/address.h
@@ -22,6 +22,8 @@ class Address : public FormGroup {
   ~Address() override;
 
   Address& operator=(const Address& address);
+  bool operator==(const Address& other) const;
+  bool operator!=(const Address& other) const { return !operator==(other); }
 
   // FormGroup:
   base::string16 GetRawInfo(ServerFieldType type) const override;