Fixing a crash in MediaCustomControlsFullscreenDetector when the page is destroyed

third_party/WebKit/Source/platform/testing/EmptyWebMediaPlayer.cpp

+// Copyright 2017 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 "platform/testing/EmptyWebMediaPlayer.h"
+
+#include "public/platform/WebSize.h"
+#include "public/platform/WebTimeRange.h"
+
+namespace blink {
+
+WebTimeRanges EmptyWebMediaPlayer::buffered() const {
+  return WebTimeRanges();
+}
+
+WebTimeRanges EmptyWebMediaPlayer::seekable() const {
+  return WebTimeRanges();
+}
+
+WebSize EmptyWebMediaPlayer::naturalSize() const {
+  return WebSize(0, 0);
+}
+
+}  // namespace blink