Introduce a couple of abstract bases for WebDataService.

chrome/browser/webdata/autofill_web_data_service_impl.cc

+// Copyright (c) 2012 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/webdata/autofill_web_data_service_impl.h"
+
+AutofillWebDataServiceImpl::AutofillWebDataServiceImpl(
+    scoped_refptr<WebDataService> service)
+    : service_(service) {
+  DCHECK(service.get());
+}
+
+WebDataServiceBase* NotificationSource() {
+  return service_.get();
+}
+
+void AutofillWebDataServiceImpl::AddFormFields(
+    const std::vector<webkit::forms::FormField>& fields) {
+  service_->AddFormFields(fields);
+}
+
+WebDataServiceBase::Handle
+AutofillWebDataServiceImpl::GetFormValuesForElementName(
+    const string16& name,
+    const string16& prefix,
+    int limit,
+    WebDataServiceConsumer* consumer) {
+  return service_->GetFormValuesForElementName(name, prefix, limit, consumer);
+}
+
+void AutofillWebDataServiceImpl::RemoveExpiredFormElements() {
+  service_->RemoveExpiredFormElements();
+}
+
+void AutofillWebDataServiceImpl::RemoveFormValueForElementName(
+    const string16& name, const string16& value) {
+  service_->RemoveFormValueForElementName(name, value);
+}
+
+void AutofillWebDataServiceImpl::AddAutofillProfile(
+    const AutofillProfile& profile) {
+  service_->AddAutofillProfile(profile);
+}
+
+void AutofillWebDataServiceImpl::UpdateAutofillProfile(
+    const AutofillProfile& profile) {
+  service_->UpdateAutofillProfile(profile);
+}
+
+void AutofillWebDataServiceImpl::RemoveAutofillProfile(
+    const std::string& guid) {
+  service_->RemoveAutofillProfile(guid);
+}
+
+WebDataServiceBase::Handle AutofillWebDataServiceImpl::GetAutofillProfiles(
+    WebDataServiceConsumer* consumer) {
+  return service_->GetAutofillProfiles(consumer);
+}
+
+void AutofillWebDataServiceImpl::EmptyMigrationTrash(bool notify_sync) {
+  service_->EmptyMigrationTrash(notify_sync);
+}
+
+void AutofillWebDataServiceImpl::AddCreditCard(const CreditCard& credit_card) {
+  service_->AddCreditCard(credit_card);
+}
+
+void AutofillWebDataServiceImpl::UpdateCreditCard(
+    const CreditCard& credit_card) {
+  service_->UpdateCreditCard(credit_card);
+}
+
+void AutofillWebDataServiceImpl::RemoveCreditCard(const std::string& guid) {
+  service_->RemoveCreditCard(guid);
+}
+
+WebDataServiceBase::Handle
+AutofillWebDataServiceImpl::GetCreditCards(WebDataServiceConsumer* consumer) {
+  return service_->GetCreditCards(consumer);
+}
+
+void AutofillWebDataServiceImpl::CancelRequest(Handle h) {
+  service_->CancelRequest(h);
+}