[Sync] ApplySyncChanges autofill implementation.

components/autofill/core/browser/webdata/autofill_entry.cc

Index: components/autofill/core/browser/webdata/autofill_entry.cc
diff --git a/components/autofill/core/browser/webdata/autofill_entry.cc b/components/autofill/core/browser/webdata/autofill_entry.cc
index 83fd639bbbd7cec47e2e1662f67a61b435dff7b0..58494a7c93e654bfb9e0775ec1e507cf04aa5e81 100644
--- a/components/autofill/core/browser/webdata/autofill_entry.cc
+++ b/components/autofill/core/browser/webdata/autofill_entry.cc
@@ -38,6 +38,8 @@ bool AutofillKey::operator<(const AutofillKey& key) const {
   return std::tie(name_, value_) < std::tie(key.name(), key.value());
 }
 
+AutofillEntry::AutofillEntry() {}
+
 AutofillEntry::AutofillEntry(const AutofillKey& key,
                              const base::Time& date_created,
                              const base::Time& date_last_used)
@@ -53,6 +55,10 @@ bool AutofillEntry::operator==(const AutofillEntry& entry) const {
          date_last_used() == entry.date_last_used();
 }
 
+bool AutofillEntry::operator!=(const AutofillEntry& entry) const {
+  return !(*this == entry);
+}
+
 bool AutofillEntry::operator<(const AutofillEntry& entry) const {
   return key_ < entry.key();
 }