[Sync] Add support for server-controlled favicon sync limit

sync/internal_api/sync_manager_impl.cc

Index: sync/internal_api/sync_manager_impl.cc
diff --git a/sync/internal_api/sync_manager_impl.cc b/sync/internal_api/sync_manager_impl.cc
index 79f0bb533be9478b3a06068a0ad74fdb924951d3..0f807bc15a22587909983a1198360fb55a94c357 100644
--- a/sync/internal_api/sync_manager_impl.cc
+++ b/sync/internal_api/sync_manager_impl.cc
@@ -1379,9 +1379,12 @@ bool SyncManagerImpl::ReceivedExperiment(Experiments* experiments) {
   ReadNode favicon_sync_node(&trans);
   if (favicon_sync_node.InitByClientTagLookup(
           syncer::EXPERIMENTS,
-          syncer::kFaviconSyncTag) == BaseNode::INIT_OK &&
-      favicon_sync_node.GetExperimentsSpecifics().favicon_sync().enabled()) {
-    experiments->favicon_sync = true;
+          syncer::kFaviconSyncTag) == BaseNode::INIT_OK) {
+    experiments->favicon_sync = favicon_sync_node.GetExperimentsSpecifics().
+        favicon_sync().enabled();
+    experiments->favicon_sync_limit =
+        favicon_sync_node.GetExperimentsSpecifics().favicon_sync().
+            favicon_sync_limit();
     found_experiment = true;
   }