Move media/capture/webm_muxer* to media/muxers

media/BUILD.gn

Index: media/BUILD.gn
diff --git a/media/BUILD.gn b/media/BUILD.gn
index 1ca0c08e621856673e2ddcc01e9f866bde7936f0..b1686f46b9a275937eb4ca62d8a7492a0d6ed30e 100644
--- a/media/BUILD.gn
+++ b/media/BUILD.gn
@@ -165,8 +165,6 @@ component("media") {
     "capture/video/win/video_capture_device_mf_win.h",
     "capture/video/win/video_capture_device_win.cc",
     "capture/video/win/video_capture_device_win.h",
-    "capture/webm_muxer.cc",
-    "capture/webm_muxer.h",
     "cdm/aes_decryptor.cc",
     "cdm/aes_decryptor.h",
     "cdm/cdm_adapter.cc",
@@ -274,6 +272,8 @@ component("media") {
     "formats/webm/webm_video_client.h",
     "formats/webm/webm_webvtt_parser.cc",
     "formats/webm/webm_webvtt_parser.h",
+    "muxers/webm_muxer.cc",
+    "muxers/webm_muxer.h",
     "renderers/audio_renderer_impl.cc",
     "renderers/audio_renderer_impl.h",
     "renderers/default_renderer_factory.cc",
@@ -626,7 +626,6 @@ test("media_unittests") {
     "capture/content/video_capture_oracle_unittest.cc",
     "capture/video/fake_video_capture_device_unittest.cc",
     "capture/video/video_capture_device_unittest.cc",
-    "capture/webm_muxer_unittest.cc",
     "cdm/aes_decryptor_unittest.cc",
     "cdm/external_clear_key_test_helper.cc",
     "cdm/external_clear_key_test_helper.h",
@@ -673,6 +672,7 @@ test("media_unittests") {
     "formats/webm/webm_parser_unittest.cc",
     "formats/webm/webm_tracks_parser_unittest.cc",
     "formats/webm/webm_webvtt_parser_unittest.cc",
+    "muxers/webm_muxer_unittest.cc",
     "renderers/audio_renderer_impl_unittest.cc",
     "renderers/renderer_impl_unittest.cc",
     "renderers/skcanvas_video_renderer_unittest.cc",