Support individual Keychain item deletion

chrome/browser/password_manager/password_store_mac.h

Index: chrome/browser/password_manager/password_store_mac.h
diff --git a/chrome/browser/password_manager/password_store_mac.h b/chrome/browser/password_manager/password_store_mac.h
index e99d7cc32695104b9d640d13af01a28136a343ad..f00fa768ebb6dbdce167babd575ac4e8061a2845 100644
--- a/chrome/browser/password_manager/password_store_mac.h
+++ b/chrome/browser/password_manager/password_store_mac.h
@@ -34,6 +34,11 @@ class PasswordStoreMac : public PasswordStore {
   // succeeded (either we added successfully, or we didn't need to).
   bool AddToKeychainIfNecessary(const webkit_glue::PasswordForm& form);
 
+  // Returns true if our database contains a form that exactly matches the given
+  // keychain form.
+  bool DatabaseHasFormMatchingKeychainForm(
+    const webkit_glue::PasswordForm& form);
+
   scoped_ptr<MacKeychain> keychain_;
   scoped_ptr<LoginDatabaseMac> login_metadata_db_;