firefoxen: remove unused gstreamer dependencies

Firefox and, by extension, Tor browser don't support gstreamer any more, this
removes what are effectively unused dependencies.

https://bugzilla.mozilla.org/show_bug.cgi?id=1234092 "Remove gstreamer support"

pkgs/applications/networking/browsers/firefox/common.nix

@@ -19,7 +19,7 @@
 
 , alsaSupport ? stdenv.isLinux, alsaLib
 , pulseaudioSupport ? stdenv.isLinux, libpulseaudio
-, ffmpegSupport ? true, gstreamer, gst-plugins-base
+, ffmpegSupport ? true
 , gtk3Support ? true, gtk2, gtk3, wrapGAppsHook
 , gssSupport ? true, kerberos
 
@@ -101,7 +101,6 @@ stdenv.mkDerivation rec {
   ++ lib.optional (lib.versionOlder ffversion "61") hunspell
   ++ lib.optional  alsaSupport alsaLib
   ++ lib.optional  pulseaudioSupport libpulseaudio # only headers are needed
-  ++ lib.optionals ffmpegSupport [ gstreamer gst-plugins-base ]
   ++ lib.optional  gtk3Support gtk3
   ++ lib.optional  gssSupport kerberos
   ++ lib.optionals stdenv.isDarwin [ CoreMedia ExceptionHandling Kerberos
@@ -221,7 +220,6 @@ stdenv.mkDerivation rec {
   ++ flag pulseaudioSupport "pulseaudio"
   ++ flag ffmpegSupport "ffmpeg"
   ++ flag gssSupport "negotiateauth"
-  ++ lib.optional (!ffmpegSupport) "--disable-gstreamer"
   ++ flag webrtcSupport "webrtc"
   ++ flag crashreporterSupport "crashreporter"
   ++ lib.optional drmSupport "--enable-eme=widevine"

pkgs/applications/networking/browsers/tor-browser-bundle-bin/default.nix

@@ -29,13 +29,10 @@
 
 # Media support (implies audio support)
 , mediaSupport ? false
-, gstreamer
-, gst-plugins-base
-, gst-plugins-good
-, gst-ffmpeg
-, gmp
 , ffmpeg
 
+, gmp
+
 # Pluggable transport dependencies
 , python27
 
@@ -85,20 +82,9 @@ let
   ]
   ++ optionals pulseaudioSupport [ libpulseaudio ]
   ++ optionals mediaSupport [
-    gstreamer
-    gst-plugins-base
-    gmp
     ffmpeg
   ];
 
-  gstPluginsPath = concatMapStringsSep ":" (x:
-    "${x}/lib/gstreamer-0.10") [
-      gstreamer
-      gst-plugins-base
-      gst-plugins-good
-      gst-ffmpeg
-    ];
-
   # Library search path for the fte transport
   fteLibPath = makeLibraryPath [ stdenv.cc.cc gmp ];
 
@@ -366,10 +352,6 @@ stdenv.mkDerivation rec {
       TOR_CONTROL_PORT="\''${TOR_CONTROL_PORT:-}" \
       TOR_SOCKS_PORT="\''${TOR_SOCKS_PORT:-}" \
       \
-      GST_PLUGIN_SYSTEM_PATH="${optionalString mediaSupport gstPluginsPath}" \
-      GST_REGISTRY="/dev/null" \
-      GST_REGISTRY_UPDATE="no" \
-      \
       FONTCONFIG_FILE="$FONTCONFIG_FILE" \
       \
       LD_LIBRARY_PATH="$libPath" \

pkgs/applications/networking/browsers/tor-browser-bundle/default.nix

@@ -19,13 +19,10 @@
 
 # Media support (implies audio support)
 , mediaSupport ? false
-, gstreamer
-, gst-plugins-base
-, gst-plugins-good
-, gst-ffmpeg
-, gmp
 , ffmpeg
 
+, gmp
+
 # Extensions, common
 , zip
 
@@ -72,18 +69,7 @@ let
 
   fontsDir = "${fontsEnv}/share/fonts";
 
-  gstPluginsPath = concatMapStringsSep ":" (x:
-    "${x}/lib/gstreamer-0.10") [
-      gstreamer
-      gst-plugins-base
-      gst-plugins-good
-      gst-ffmpeg
-    ];
-
-  gstLibPath = makeLibraryPath [
-    gstreamer
-    gst-plugins-base
-    gmp
+  mediaLibPath = makeLibraryPath [
     ffmpeg
   ];
 in
@@ -207,7 +193,7 @@ stdenv.mkDerivation rec {
     ''}
 
     ${optionalString mediaSupport ''
-      wrapper_LD_LIBRARY_PATH=${gstLibPath}''${wrapper_LD_LIBRARY_PATH:+:$wrapper_LD_LIBRARY_PATH}
+      wrapper_LD_LIBRARY_PATH=${mediaLibPath}''${wrapper_LD_LIBRARY_PATH:+:$wrapper_LD_LIBRARY_PATH}
     ''}
 
     mkdir -p $out/bin
@@ -284,10 +270,6 @@ stdenv.mkDerivation rec {
     #
     # APULSE_PLAYBACK_DEVICE is for audio playback w/o pulseaudio (no capture yet)
     #
-    # GST_PLUGIN_SYSTEM_PATH is for HD video playback
-    #
-    # GST_REGISTRY is set to devnull to minimize disk writes
-    #
     # TOR_* is for using an external tor instance
     #
     # Parameters lacking a default value below are *required* (enforced by
@@ -314,10 +296,6 @@ stdenv.mkDerivation rec {
       \
       APULSE_PLAYBACK_DEVICE="\''${APULSE_PLAYBACK_DEVICE:-plug:dmix}" \
       \
-      GST_PLUGIN_SYSTEM_PATH="${optionalString mediaSupport gstPluginsPath}" \
-      GST_REGISTRY="/dev/null" \
-      GST_REGISTRY_UPDATE="no" \
-      \
       TOR_SKIP_LAUNCH="\''${TOR_SKIP_LAUNCH:-}" \
       TOR_CONTROL_PORT="\''${TOR_CONTROL_PORT:-}" \
       TOR_SOCKS_PORT="\''${TOR_SOCKS_PORT:-}" \