Revert of [sync] Add Sessions integration tests

components/sync/test/fake_server/sessions_hierarchy.h

Index: components/sync/test/fake_server/sessions_hierarchy.h
diff --git a/components/sync/test/fake_server/sessions_hierarchy.h b/components/sync/test/fake_server/sessions_hierarchy.h
index 93199ca5e0c62cdb409d3bffef9ce8549d5bd8b4..8d323d499b6fc48f684207e8d83bda2607b6fffe 100644
--- a/components/sync/test/fake_server/sessions_hierarchy.h
+++ b/components/sync/test/fake_server/sessions_hierarchy.h
@@ -20,12 +20,6 @@
  public:
   // Creates an empty (no windows) SessionsHierachy.
   SessionsHierarchy();
-
-  // Copy constructor.
-  SessionsHierarchy(const SessionsHierarchy& other);
-
-  // Creates a SessionsHierarchy with specified set of windows.
-  SessionsHierarchy(std::initializer_list<std::multiset<std::string>> windows);
 
   ~SessionsHierarchy();