Remove knowledge of Chrome-specific SyncableService classes from WebDataService.

chrome/browser/webdata/autofill_profile_syncable_service.cc

Index: chrome/browser/webdata/autofill_profile_syncable_service.cc
diff --git a/chrome/browser/webdata/autofill_profile_syncable_service.cc b/chrome/browser/webdata/autofill_profile_syncable_service.cc
index 980ca80777024864aac2a495c4c06dd88a39bff7..ab89e213140a66b84bfef0f454012b7a1c46279a 100644
--- a/chrome/browser/webdata/autofill_profile_syncable_service.cc
+++ b/chrome/browser/webdata/autofill_profile_syncable_service.cc
@@ -33,6 +33,27 @@ std::string LimitData(const std::string& data) {
   return sanitized_value;
 }
 
+class DataObject : public base::SupportsUserData::Data {
+ public:
+  explicit DataObject(scoped_ptr<AutofillProfileSyncableService> service)
+      : service_(service.Pass()) {
+  }
+
+  AutofillProfileSyncableService* service() {
+    return service_.get();
+  }
+
+ private:
+  scoped_ptr<AutofillProfileSyncableService> service_;
+
+  DISALLOW_COPY_AND_ASSIGN(DataObject);
+};
+
+void* DataKey() {
+  return reinterpret_cast<void*>(
+      &AutofillProfileSyncableService::AttachToWebData);
+}
+
 }  // namespace
 
 const char kAutofillProfileTag[] = "google_chrome_autofill_profiles";
@@ -52,6 +73,21 @@ AutofillProfileSyncableService::~AutofillProfileSyncableService() {
   DCHECK(CalledOnValidThread());
 }
 
+// static
+AutofillProfileSyncableService* AutofillProfileSyncableService::FromWebData(
+    WebDataServiceBase* service) {
+  return static_cast<DataObject*>(
+      service->GetDBUserData()->GetUserData(DataKey()))->service();
+}
+
+// static
+void AutofillProfileSyncableService::AttachToWebData(
+    scoped_ptr<AutofillProfileSyncableService> service,
+    WebDataServiceBase* web_data) {
+  web_data->GetDBUserData()->SetUserData(DataKey(),
+                                         new DataObject(service.Pass()));
+}
+
 AutofillProfileSyncableService::AutofillProfileSyncableService()
     : web_data_service_(NULL) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::DB));