Fixing flaky testMoveButtonsGoneWithOneBookmark

Bug: 990550
Change-Id: I72b8629a1b5bebe29921425036f67f3412ffadcc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1749443Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Jenna Himawan <jhimawan@google.com>
Cr-Commit-Position: refs/heads/master@{#686201}

chrome/android/javatests/src/org/chromium/chrome/browser/bookmarks/BookmarkReorderTest.java

@@ -563,7 +563,7 @@ public class BookmarkReorderTest extends BookmarkTest {
     @MediumTest
     public void testMoveButtonsGoneWithOneBookmark() throws Exception {
         addFolder(TEST_FOLDER_TITLE);
-        BookmarkPromoHeader.forcePromoStateForTests(BookmarkPromoHeader.PromoState.PROMO_SYNC);
+        forceSyncHeaderState();
         openBookmarkManager();
 
         View testFolder = mItemsContainer.findViewHolderForAdapterPosition(1).itemView;