Componentize //chrome/browser/prefs/tracked.

chrome/browser/prefs/tracked/interceptable_pref_filter.cc

-// Copyright 2014 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/tracked/interceptable_pref_filter.h"
-
-#include "base/bind.h"
-
-InterceptablePrefFilter::InterceptablePrefFilter() {}
-InterceptablePrefFilter::~InterceptablePrefFilter() {}
-
-void InterceptablePrefFilter::FilterOnLoad(
-    const PostFilterOnLoadCallback& post_filter_on_load_callback,
-    scoped_ptr<base::DictionaryValue> pref_store_contents) {
-  if (filter_on_load_interceptor_.is_null()) {
-    FinalizeFilterOnLoad(post_filter_on_load_callback,
-                         pref_store_contents.Pass(),
-                         false);
-  } else {
-    // Note, in practice (in the implementation as it was in May 2014) it would
-    // be okay to pass an unretained |this| pointer below, but in order to avoid
-    // having to augment the API everywhere to explicitly enforce the ownership
-    // model as it happens to currently be: make the relationship simpler by
-    // weakly binding the FinalizeFilterOnLoadCallback below to |this|.
-    const FinalizeFilterOnLoadCallback finalize_filter_on_load(
-        base::Bind(&InterceptablePrefFilter::FinalizeFilterOnLoad,
-                   AsWeakPtr(),
-                   post_filter_on_load_callback));
-    filter_on_load_interceptor_.Run(finalize_filter_on_load,
-                                    pref_store_contents.Pass());
-    filter_on_load_interceptor_.Reset();
-  }
-}
-
-void InterceptablePrefFilter::InterceptNextFilterOnLoad(
-    const FilterOnLoadInterceptor& filter_on_load_interceptor) {
-  DCHECK(filter_on_load_interceptor_.is_null());
-  filter_on_load_interceptor_ = filter_on_load_interceptor;
-}