[Sync] Add support for automatic enabling of syncing tab favicons.

chrome/browser/sync/glue/sync_backend_host.cc

Index: chrome/browser/sync/glue/sync_backend_host.cc
diff --git a/chrome/browser/sync/glue/sync_backend_host.cc b/chrome/browser/sync/glue/sync_backend_host.cc
index 42aed598fa0d2f182f5c658f5e70ef2c5f3c37d3..398881a1433b352a76b955fe26fd7a9c0d8bb491 100644
--- a/chrome/browser/sync/glue/sync_backend_host.cc
+++ b/chrome/browser/sync/glue/sync_backend_host.cc
@@ -46,6 +46,7 @@
 #include "sync/protocol/encryption.pb.h"
 #include "sync/protocol/sync.pb.h"
 #include "sync/util/nigori.h"
+#include "sync/util/sync_experiments.h"
 
 static const int kSaveChangesIntervalSeconds = 10;
 static const FilePath::CharType kSyncDataFolderName[] =
@@ -1212,9 +1213,9 @@ void SyncBackendHost::Core::SaveChanges() {
 
 void SyncBackendHost::AddExperimentalTypes() {
   CHECK(initialized());
-  syncable::ModelTypeSet to_add;
-  if (core_->sync_manager()->ReceivedExperimentalTypes(&to_add))
-    frontend_->OnDataTypesChanged(to_add);
+  SyncExperiments experiments;
+  if (core_->sync_manager()->ReceivedExperiment(&experiments))
+    frontend_->OnExperimentsChanged(experiments);
 }
 
 void SyncBackendHost::OnNigoriDownloadRetry() {