stats.lua: remove compatibility aliases of properties

These are ancient and have existed since before stats.lua lived in the
mpv repository. We don't need to worry about ancient mpv versions
anymore, so remove these.

player/lua/stats.lua

@@ -114,12 +114,6 @@ local perf_buffers = {}
 -- Save all properties known to this version of mpv
 local property_list = {}
 for p in string.gmatch(mp.get_property("property-list"), "([^,]+)") do property_list[p] = true end
--- Mapping of properties to their deprecated names
-local property_aliases = {
-    ["decoder-frame-drop-count"] = "drop-frame-count",
-    ["frame-drop-count"] = "vo-drop-frame-count",
-    ["container-fps"] = "fps",
-}
 
 local function graph_add_value(graph, value)
     graph.pos = (graph.pos % graph.len) + 1
@@ -127,14 +121,6 @@ local function graph_add_value(graph, value)
     graph.max = max(graph.max, value)
 end
 
--- Return deprecated name for the given property
-local function compat(p)
-    while not property_list[p] and property_aliases[p] do
-        p = property_aliases[p]
-    end
-    return p
-end
-
 -- "\\<U+2060>" in UTF-8 (U+2060 is WORD-JOINER)
 local ESC_BACKSLASH = "\\" .. string.char(0xE2, 0x81, 0xA0)
 
@@ -300,7 +286,7 @@ local function append_perfdata(s, dedicated_page, print_passes)
 
     local ds = mp.get_property_bool("display-sync-active", false)
     local target_fps = ds and mp.get_property_number("display-fps", 0)
-                       or mp.get_property_number(compat("container-fps"), 0)
+                       or mp.get_property_number("container-fps", 0)
     if target_fps > 0 then target_fps = 1 / target_fps * 1e9 end
 
     -- Sums of all last/avg/peak values
@@ -866,9 +852,9 @@ local function add_video_out(s)
                                          no_prefix_markup=true, nl="", indent=" "})
     append_property(s, "avsync", {prefix="A-V:"})
     append_fps(s, "display-fps", "estimated-display-fps")
-    if append_property(s, compat("decoder-frame-drop-count"),
+    if append_property(s, "decoder-frame-drop-count",
                        {prefix="Dropped Frames:", suffix=" (decoder)"}) then
-        append_property(s, compat("frame-drop-count"), {suffix=" (output)", nl="", indent=""})
+        append_property(s, "frame-drop-count", {suffix=" (output)", nl="", indent=""})
     end
     append_display_sync(s)
     append_perfdata(s, false, o.print_perfdata_passes)