[Sync] Remove SyncController.setSyncNotificationController()

This was used as part of an upstream transition and is no longer used.

BUG=428882

Review URL: https://codereview.chromium.org/1026333005

Cr-Commit-Position: refs/heads/master@{#322484}

chrome/android/java/src/org/chromium/chrome/browser/sync/SyncController.java

@@ -199,16 +199,6 @@ public class SyncController implements ProfileSyncService.SyncStateChangedListen
         });
     }
 
-    /**
-     * Sets the SyncNotificationController.
-     *
-     * This is a temporary method for transferring ownership of SyncNotificationController
-     * upstream. SNC is now created in the constructor and this method can be removed once
-     * the downstream call from GoogleServicesManager is removed.
-     */
-    public void setSyncNotificationController(SyncNotificationController snc) {
-    }
-
     /**
      * Returns the SyncNotificationController.
      */