Revert of [sync] "TwoClientBookmarksSyncTest.Sanity" is flaky

chrome/browser/sync/test/integration/bookmarks_helper.h

Index: chrome/browser/sync/test/integration/bookmarks_helper.h
diff --git a/chrome/browser/sync/test/integration/bookmarks_helper.h b/chrome/browser/sync/test/integration/bookmarks_helper.h
index 115de8efbab86fe4b83260adc27997bbc7c13a98..ae9fd7f8d60ed7669c4e60ec183616d142f9025f 100644
--- a/chrome/browser/sync/test/integration/bookmarks_helper.h
+++ b/chrome/browser/sync/test/integration/bookmarks_helper.h
@@ -221,16 +221,6 @@
 class BookmarksMatchChecker : public MultiClientStatusChangeChecker {
  public:
   BookmarksMatchChecker();
-
-  // StatusChangeChecker implementation.
-  bool IsExitConditionSatisfied() override;
-  std::string GetDebugMessage() const override;
-};
-
-// Checker used to block until bookmarks match the verifier bookmark model.
-class BookmarksMatchVerifierChecker : public MultiClientStatusChangeChecker {
- public:
-  BookmarksMatchVerifierChecker();
 
   // StatusChangeChecker implementation.
   bool IsExitConditionSatisfied() override;