[Sync] Have SBH tell SyncManager which types to purge

chrome/browser/sync/glue/sync_backend_host_unittest.cc

Index: chrome/browser/sync/glue/sync_backend_host_unittest.cc
diff --git a/chrome/browser/sync/glue/sync_backend_host_unittest.cc b/chrome/browser/sync/glue/sync_backend_host_unittest.cc
index da3cc97ee4e80b03a48003b7a1d3a18e8fb21dd4..423a491f16f669c6be7513dc1957fe6d27f9ca40 100644
--- a/chrome/browser/sync/glue/sync_backend_host_unittest.cc
+++ b/chrome/browser/sync/glue/sync_backend_host_unittest.cc
@@ -691,8 +691,9 @@ TEST_F(SyncBackendHostTest, DownloadControlTypes) {
   // any old types.
   InitializeBackend(true);
   EXPECT_TRUE(fake_manager_->GetAndResetDownloadedTypes().Equals(new_types));
-  EXPECT_TRUE(Intersection(fake_manager_->GetAndResetCleanedTypes(),
-                           enabled_types_).Empty());
+  EXPECT_TRUE(fake_manager_->GetAndResetCleanedTypes().Equals(
+                  Difference(syncer::ModelTypeSet::All(),
+                             enabled_types_)));
   EXPECT_TRUE(fake_manager_->InitialSyncEndedTypes().Equals(enabled_types_));
   EXPECT_TRUE(fake_manager_->GetTypesWithEmptyProgressMarkerToken(
       enabled_types_).Empty());