Initial clear server data impl

chrome/browser/sync/test/integration/sync_datatype_helper.cc

Index: chrome/browser/sync/test/integration/sync_datatype_helper.cc
diff --git a/chrome/browser/sync/test/integration/sync_datatype_helper.cc b/chrome/browser/sync/test/integration/sync_datatype_helper.cc
index be6a44d0d9cce9a5b18056fd7688521697d93d5b..b75eeab1047f3e8a2d9f748d0d0187bf95274f98 100644
--- a/chrome/browser/sync/test/integration/sync_datatype_helper.cc
+++ b/chrome/browser/sync/test/integration/sync_datatype_helper.cc
@@ -21,6 +21,11 @@ void AssociateWithTest(SyncTest* test) {
   ::test = test;
 }
 
+void DissociateWithTest(SyncTest* test) {
+  ASSERT_EQ(test, ::test) << "Not associated with this test.";
+  ::test = nullptr;
+}
+
 SyncTest* test() {
   EXPECT_NE(nullptr, ::test) << "Must call AssociateWithTest first.";
   return ::test;