sync: Move unique_client_tag hashing code

sync/internal_api/read_node.cc

Index: sync/internal_api/read_node.cc
diff --git a/sync/internal_api/read_node.cc b/sync/internal_api/read_node.cc
index 2873b0d4ac718f4364030171126647c6bf637093..54196657e5c43a0f727fb9b918c53fc1a17166a8 100644
--- a/sync/internal_api/read_node.cc
+++ b/sync/internal_api/read_node.cc
@@ -8,6 +8,7 @@
 #include "sync/internal_api/public/base_transaction.h"
 #include "sync/syncable/entry.h"
 #include "sync/syncable/syncable_base_transaction.h"
+#include "sync/syncable/syncable_util.h"
 
 namespace syncer {
 
@@ -57,7 +58,7 @@ BaseNode::InitByLookupResult ReadNode::InitByClientTagLookup(
   if (tag.empty())
     return INIT_FAILED_PRECONDITION;
 
-  const std::string hash = GenerateSyncableHash(model_type, tag);
+  const std::string hash = syncable::GenerateSyncableHash(model_type, tag);
 
   entry_ = new syncable::Entry(transaction_->GetWrappedTrans(),
                                syncable::GET_BY_CLIENT_TAG, hash);