[Sync] Tidy up SyncBackendHost interface.

chrome/common/notification_type.h

Index: chrome/common/notification_type.h
diff --git a/chrome/common/notification_type.h b/chrome/common/notification_type.h
index 2b8219c8542c496ec79545fb760eb7a89dff37fd..ffbe5b431a7672b1b0f1627ecf2cfe8a4d56edec 100644
--- a/chrome/common/notification_type.h
+++ b/chrome/common/notification_type.h
@@ -1155,20 +1155,6 @@ class NotificationType {
     // session data.
     FOREIGN_SESSION_DISABLED,
 
-    // The syncer requires a passphrase to decrypt sensitive updates. This
-    // notification is sent when the first sensitive data type is setup by the
-    // user as well as anytime any the passphrase is changed in another synced
-    // client.  The source is the SyncBackendHost wanting a passphrase.  The
-    // details are a boolean: true if the passphrase is required for decryption,
-    // false if only required for encryption.
-    SYNC_PASSPHRASE_REQUIRED,
-
-    // Sent when the passphrase provided by the user is accepted. After this
-    // notification is sent, updates to sensitive nodes are encrypted using the
-    // accepted passphrase.  The source is the SyncBackendHost that accepted
-    // the passphrase.  No details.
-    SYNC_PASSPHRASE_ACCEPTED,
-
     // Sent when the set of data types that should be synced has been modified
     // externally (eg. by the dom_ui options screen).
     // The source is the Profile, there are no details.