Support to remove passwords by date_synced timestamp.

components/password_manager/core/browser/password_store.h

Index: components/password_manager/core/browser/password_store.h
diff --git a/components/password_manager/core/browser/password_store.h b/components/password_manager/core/browser/password_store.h
index 6bb063dff17a2a65067d614c645ea6a9e88c2a89..13074d863104435bed562164f71adc99a3945122 100644
--- a/components/password_manager/core/browser/password_store.h
+++ b/components/password_manager/core/browser/password_store.h
@@ -142,6 +142,10 @@ class PasswordStore : protected PasswordStoreSync,
   virtual void RemoveLoginsCreatedBetween(const base::Time& delete_begin,
                                           const base::Time& delete_end);
 
+  // Removes all logins synced in the given date range.
+  virtual void RemoveLoginsSyncedBetween(const base::Time& delete_begin,
+                                         const base::Time& delete_end);
+
   // Searches for a matching PasswordForm, and notifies |consumer| on
   // completion. The request will be cancelled if the consumer is destroyed.
   // |prompt_policy| indicates whether it's permissible to prompt the user to
@@ -215,6 +219,10 @@ class PasswordStore : protected PasswordStoreSync,
   virtual PasswordStoreChangeList RemoveLoginsCreatedBetweenImpl(
       const base::Time& delete_begin, const base::Time& delete_end) = 0;
 
+  // Synchronous implementation to remove the given logins.
+  virtual PasswordStoreChangeList RemoveLoginsSyncedBetweenImpl(
+      const base::Time& delete_begin, const base::Time& delete_end) = 0;
+
   typedef base::Callback<void(const std::vector<autofill::PasswordForm*>&)>
       ConsumerCallbackRunner;  // Owns all PasswordForms in the vector.