Revert of Retry to add MockPresentationClient to use in layout tests.

content/shell/renderer/test_runner/mock_presentation_service.cc

-// Copyright 2015 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 "content/shell/renderer/test_runner/mock_presentation_service.h"
-
-#include "base/logging.h"
-
-namespace content {
-
-MockPresentationService::MockPresentationService()
-    : screen_availability_(false) {
-}
-
-MockPresentationService::~MockPresentationService() {
-  Reset();
-}
-
-void MockPresentationService::SetScreenAvailability(bool available) {
-  if (screen_availability_ == available)
-    return;
-  screen_availability_ = available;
-
-  FOR_EACH_OBSERVER(
-      MockPresentationClient,
-      presentation_clients_,
-      SetScreenAvailability(available));
-}
-
-void MockPresentationService::Reset() {
-  FOR_EACH_OBSERVER(MockPresentationClient, presentation_clients_, Reset());
-  presentation_clients_.Clear();
-  screen_availability_ = false;
-}
-
-void MockPresentationService::RegisterPresentationClientMock(
-    MockPresentationClient* client) {
-  DCHECK(client);
-  presentation_clients_.AddObserver(client);
-}
-
-void MockPresentationService::UnregisterPresentationClientMock(
-    MockPresentationClient* client) {
-  DCHECK(client);
-  presentation_clients_.RemoveObserver(client);
-}
-
-}  // namespace content