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

third_party/WebKit/Source/core/html/BUILD.gn

Index: third_party/WebKit/Source/core/html/BUILD.gn
diff --git a/third_party/WebKit/Source/core/html/BUILD.gn b/third_party/WebKit/Source/core/html/BUILD.gn
index 48b43cf7912ed70a54a09e7c2de737cc51d57494..4fdaa85aa924defa6cc60259e0595b0899029b58 100644
--- a/third_party/WebKit/Source/core/html/BUILD.gn
+++ b/third_party/WebKit/Source/core/html/BUILD.gn
@@ -9,8 +9,6 @@ blink_core_sources("html") {
   split_count = 5
 
   sources = [
-    "AutoplayUmaHelper.cpp",
-    "AutoplayUmaHelper.h",
     "ClassList.cpp",
     "ClassList.h",
     "CollectionItemsCache.h",
@@ -122,10 +120,6 @@ blink_core_sources("html") {
     "HTMLMarqueeElement.h",
     "HTMLMediaElement.cpp",
     "HTMLMediaElement.h",
-    "HTMLMediaElementControlsList.cpp",
-    "HTMLMediaElementControlsList.h",
-    "HTMLMediaSource.cpp",
-    "HTMLMediaSource.h",
     "HTMLMenuElement.cpp",
     "HTMLMenuElement.h",
     "HTMLMenuItemElement.cpp",
@@ -242,13 +236,6 @@ blink_core_sources("html") {
     "LinkStyle.h",
     "ListedElement.cpp",
     "ListedElement.h",
-    "MediaCustomControlsFullscreenDetector.cpp",
-    "MediaCustomControlsFullscreenDetector.h",
-    "MediaDocument.cpp",
-    "MediaDocument.h",
-    "MediaError.h",
-    "MediaFragmentURIParser.cpp",
-    "MediaFragmentURIParser.h",
     "PluginDocument.cpp",
     "PluginDocument.h",
     "PublicURLManager.cpp",
@@ -382,6 +369,19 @@ blink_core_sources("html") {
     "imports/HTMLImportsController.h",
     "imports/LinkImport.cpp",
     "imports/LinkImport.h",
+    "media/AutoplayUmaHelper.cpp",
+    "media/AutoplayUmaHelper.h",
+    "media/HTMLMediaElementControlsList.cpp",
+    "media/HTMLMediaElementControlsList.h",
+    "media/HTMLMediaSource.cpp",
+    "media/HTMLMediaSource.h",
+    "media/MediaCustomControlsFullscreenDetector.cpp",
+    "media/MediaCustomControlsFullscreenDetector.h",
+    "media/MediaDocument.cpp",
+    "media/MediaDocument.h",
+    "media/MediaError.h",
+    "media/MediaFragmentURIParser.cpp",
+    "media/MediaFragmentURIParser.h",
     "parser/AtomicHTMLToken.cpp",
     "parser/AtomicHTMLToken.h",
     "parser/BackgroundHTMLInputStream.cpp",