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

third_party/WebKit/Source/core/BUILD.gn

Index: third_party/WebKit/Source/core/BUILD.gn
diff --git a/third_party/WebKit/Source/core/BUILD.gn b/third_party/WebKit/Source/core/BUILD.gn
index c8cabb491b2f50668b86b0e8b56a502bc5508b10..acd23bf5fdc592254a42661d8be3663cc7633529 100644
--- a/third_party/WebKit/Source/core/BUILD.gn
+++ b/third_party/WebKit/Source/core/BUILD.gn
@@ -1225,7 +1225,6 @@ source_set("unit_tests") {
     "frame/csp/MediaListDirectiveTest.cpp",
     "frame/csp/SourceListDirectiveTest.cpp",
     "geometry/DOMMatrixTest.cpp",
-    "html/AutoplayUmaHelperTest.cpp",
     "html/FormDataTest.cpp",
     "html/HTMLDimensionTest.cpp",
     "html/HTMLEmbedElementTest.cpp",
@@ -1246,7 +1245,6 @@ source_set("unit_tests") {
     "html/ImageDataTest.cpp",
     "html/ImageDocumentTest.cpp",
     "html/LinkRelAttributeTest.cpp",
-    "html/MediaCustomControlsFullscreenDetectorTest.cpp",
     "html/TextControlElementTest.cpp",
     "html/TimeRangesTest.cpp",
     "html/canvas/CanvasAsyncBlobCreatorTest.cpp",
@@ -1256,6 +1254,8 @@ source_set("unit_tests") {
     "html/forms/OptionListTest.cpp",
     "html/forms/PasswordInputTypeTest.cpp",
     "html/forms/StepRangeTest.cpp",
+    "html/media/AutoplayUmaHelperTest.cpp",
+    "html/media/MediaCustomControlsFullscreenDetectorTest.cpp",
     "html/parser/AtomicHTMLTokenTest.cpp",
     "html/parser/CSSPreloadScannerTest.cpp",
     "html/parser/CompactHTMLTokenTest.cpp",