Remove dependency of PrefSyncableService on Profile.

chrome/browser/prefs/pref_model_associator_client.cc

+// Copyright 2015 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/prefs/pref_model_associator_client.h"
+
+#include "base/logging.h"
+
+PrefModelAssociatorClient::PrefModelAssociatorClient() {}
+
+PrefModelAssociatorClient::~PrefModelAssociatorClient() {}
+
+void PrefModelAssociatorClient::RegisterPreference(
+    const std::string& pref_name,
+    PrefModelAssociatorPreferenceType pref_type) {
+  DCHECK(pref_registry_.find(pref_name) == pref_registry_.end());
+  pref_registry_[pref_name] = pref_type;
+}
+
+bool PrefModelAssociatorClient::IsPreferenceMerged(
+    const std::string& pref_name,
+    PrefModelAssociatorPreferenceType* pref_type) {
+  auto iter = pref_registry_.find(pref_name);
+  if (iter == pref_registry_.end())
+    return false;
+  *pref_type = iter->second;
+  return true;
+}