remove remaining references to XMA

the bulk of the functionality was removed in:
a42b5c2 Removing legacy XMA features from libvpx.

BUG=840

Change-Id: I8ca51d6aa76028f36d0eb1a15d2f2e3161e12ea4
diff --git a/vpx/src/vpx_decoder.c b/vpx/src/vpx_decoder.c
index 276238b..d9c8a95 100644
--- a/vpx/src/vpx_decoder.c
+++ b/vpx/src/vpx_decoder.c
@@ -31,8 +31,6 @@
     res = VPX_CODEC_INVALID_PARAM;
   else if (iface->abi_version != VPX_CODEC_INTERNAL_ABI_VERSION)
     res = VPX_CODEC_ABI_MISMATCH;
-  else if ((flags & VPX_CODEC_USE_XMA) && !(iface->caps & VPX_CODEC_CAP_XMA))
-    res = VPX_CODEC_INCAPABLE;
   else if ((flags & VPX_CODEC_USE_POSTPROC) && !(iface->caps & VPX_CODEC_CAP_POSTPROC))
     res = VPX_CODEC_INCAPABLE;
   else if ((flags & VPX_CODEC_USE_ERROR_CONCEALMENT) &&
@@ -50,19 +48,15 @@
     ctx->priv = NULL;
     ctx->init_flags = flags;
     ctx->config.dec = cfg;
-    res = VPX_CODEC_OK;
 
-    if (!(flags & VPX_CODEC_USE_XMA)) {
-      res = ctx->iface->init(ctx, NULL);
-
-      if (res) {
-        ctx->err_detail = ctx->priv ? ctx->priv->err_detail : NULL;
-        vpx_codec_destroy(ctx);
-      }
-
-      if (ctx->priv)
-        ctx->priv->iface = ctx->iface;
+    res = ctx->iface->init(ctx, NULL);
+    if (res) {
+      ctx->err_detail = ctx->priv ? ctx->priv->err_detail : NULL;
+      vpx_codec_destroy(ctx);
     }
+
+    if (ctx->priv)
+      ctx->priv->iface = ctx->iface;
   }
 
   return SAVE_STATUS(ctx, res);