Introduce a couple of abstract bases for WebDataService.

chrome/browser/webdata/web_data_service_factory.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/web_data_service_factory.h"
 
 #include "base/file_path.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
+#include "chrome/browser/webdata/autofill_web_data_service_impl.h"
 #include "chrome/browser/webdata/web_data_service.h"
 #include "chrome/common/chrome_constants.h"
 
+// static
+scoped_ptr<AutofillWebDataService> AutofillWebDataServiceImpl::ForContext(
+    content::BrowserContext* context) {
+  // TODO(joi): Does the implicit/explicit distinction really matter?

[erikwright (departed), 2012/09/11 20:49:06]

Presumably you will answer this question before committing this code?

+  // It's just used for a DCHECK.
+  scoped_refptr<WebDataService> service = WebDataServiceFactory::GetForProfile(
+      static_cast<Profile*>(context), Profile::EXPLICIT_ACCESS);
+  return scoped_ptr<AutofillWebDataService>(
+      new AutofillWebDataServiceImpl(service));
+}
+
 WebDataServiceFactory::WebDataServiceFactory()
     : RefcountedProfileKeyedServiceFactory(
           "WebDataService",
           ProfileDependencyManager::GetInstance()) {
   // WebDataServiceFactory has no dependecies.
 }
 
 WebDataServiceFactory::~WebDataServiceFactory() {}
 
 // static
@@ skipping 30 matching lines @@
 
   scoped_refptr<WebDataService> wds(new WebDataService());
   if (!wds->Init(profile->GetPath()))
     NOTREACHED();
   return wds.get();
 }
 
 bool WebDataServiceFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }