Revert 138216 - [Sync] Turn notifier::PushClient into an interface

jingle/notifier/listener/notification_defines.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 "jingle/notifier/listener/notification_defines.h"
 
-#include <cstddef>
-
 namespace notifier {
 
-Subscription::Subscription() {}
-Subscription::~Subscription() {}
-
-bool Subscription::Equals(const Subscription& other) const {
-  return channel == other.channel && from == other.from;
-}
-
-namespace {
-
-template <typename T>
-bool ListsEqual(const T& t1, const T& t2) {
-  if (t1.size() != t2.size()) {
-    return false;
-  }
-  for (size_t i = 0; i < t1.size(); ++i) {
-    if (!t1[i].Equals(t2[i])) {
-      return false;
-    }
-  }
-  return true;
-}
-
-}  // namespace
-
-bool SubscriptionListsEqual(const SubscriptionList& subscriptions1,
-                            const SubscriptionList& subscriptions2) {
-  return ListsEqual(subscriptions1, subscriptions2);
-}
-
-Recipient::Recipient() {}
-Recipient::~Recipient() {}
-
-bool Recipient::Equals(const Recipient& other) const {
-  return to == other.to && user_specific_data == other.user_specific_data;
-}
-
-bool RecipientListsEqual(const RecipientList& recipients1,
-                         const RecipientList& recipients2) {
-  return ListsEqual(recipients1, recipients2);
-}
-
 Notification::Notification() {}
 Notification::~Notification() {}
 
-bool Notification::Equals(const Notification& other) const {
-  return
-      channel == other.channel &&
-      data == other.data &&
-      RecipientListsEqual(recipients, other.recipients);
-}
-
 std::string Notification::ToString() const {
   return "{ channel: \"" + channel + "\", data: \"" + data + "\" }";
 }
 
 }  // namespace notifier