Create core/html/media/ and move auxiliary media files in it.

third_party/WebKit/Source/core/html/HTMLMediaElementEventListenersTest.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 "core/html/HTMLMediaElement.h"
 
 #include "core/dom/DocumentUserGestureToken.h"
 #include "core/dom/Fullscreen.h"
 #include "core/html/HTMLVideoElement.h"
-#include "core/html/MediaCustomControlsFullscreenDetector.h"
+#include "core/html/media/MediaCustomControlsFullscreenDetector.h"
 #include "core/html/shadow/MediaControls.h"
 #include "core/loader/EmptyClients.h"
 #include "core/testing/DummyPageHolder.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/UserGestureIndicator.h"
 #include "platform/testing/EmptyWebMediaPlayer.h"
 #include "platform/testing/UnitTestHelpers.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 154 matching lines @@
   EXPECT_FALSE(isCheckViewportIntersectionTimerActive(detector));
   // Should only notify the false value when ExecutionContext is destroyed.
   EXPECT_EQ(1u, observedResults.size());
   EXPECT_FALSE(observedResults[0]);
 
   RuntimeEnabledFeatures::setVideoFullscreenDetectionEnabled(
       originalVideoFullscreenDetectionEnabled);
 }
 
 }  // namespace blink