Clean up. Experimental user avatars removed.

media/BUILD.gn

Index: media/BUILD.gn
diff --git a/media/BUILD.gn b/media/BUILD.gn
index f2acd92058a1f9ded7d903cc87cef344cc060509..5dc5ebd084b74fc949208ad3a951f26b0c54206c 100644
--- a/media/BUILD.gn
+++ b/media/BUILD.gn
@@ -474,27 +474,6 @@ component("media") {
     }
   }
 
-  if (is_chromeos) {
-    # A simple WebM encoder for animated avatars on ChromeOS.
-    sources += [
-      "formats/webm/chromeos/ebml_writer.cc",
-      "formats/webm/chromeos/ebml_writer.h",
-      "formats/webm/chromeos/webm_encoder.cc",
-      "formats/webm/chromeos/webm_encoder.h",
-    ]
-    deps += [
-      "//third_party/libvpx",
-      "//third_party/libyuv"
-    ]
-    # For VaapiVideoEncodeAccelerator.
-    if (cpu_arch != "arm" && use_x11) {
-      sources += [
-        "filters/h264_bitstream_buffer.cc",
-        "filters/h264_bitstream_buffer.h",
-      ]
-    }
-  }
-
   if (!is_ios) {
     deps += [ "//third_party/libyuv" ]
   }