Remove BindStateHolder and have Bind() return a Callback<> object directly.

chrome/browser/sync/glue/session_model_associator.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/sync/glue/session_model_associator.h"
 
 #include <algorithm>
 #include <set>
 #include <utility>
 
@@ skipping 536 matching lines @@
 void SessionModelAssociator::InitializeCurrentMachineTag(
     sync_api::WriteTransaction* trans) {
   DCHECK(CalledOnValidThread());
   syncable::Directory* dir = trans->GetWrappedWriteTrans()->directory();
   current_machine_tag_ = "session_sync";
   current_machine_tag_.append(dir->cache_guid());
   DVLOG(1) << "Creating machine tag: " << current_machine_tag_;
   tab_pool_.set_machine_tag(current_machine_tag_);
 }
 
-void SessionModelAssociator::OnSessionNameInitialized(const std::string name) {
+void SessionModelAssociator::OnSessionNameInitialized(
+    const std::string& name) {
   DCHECK(CalledOnValidThread());
   // Only use the default machine name if it hasn't already been set.
   if (current_session_name_.empty())
     current_session_name_ = name;
 }
 
 void SessionModelAssociator::InitializeCurrentSessionName() {
   DCHECK(CalledOnValidThread());
   if (setup_for_test_) {
     OnSessionNameInitialized("TestSessionName");
@@ skipping 679 matching lines @@
 bool SessionModelAssociator::CryptoReadyIfNecessary() {
   // We only access the cryptographer while holding a transaction.
   sync_api::ReadTransaction trans(FROM_HERE, sync_service_->GetUserShare());
   const syncable::ModelEnumSet encrypted_types =
       sync_api::GetEncryptedTypes(&trans);
   return !encrypted_types.Has(SESSIONS) ||
          sync_service_->IsCryptographerReady(&trans);
 }
 
 }  // namespace browser_sync