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vp9: make VPX_CODEC_USE_FRAME_THREADING a no-op

this is unmaintained and due to be removed

BUG=webm:1395

Change-Id: Iaffa6aa057c820fd1a182b93ebb45d4286e1306e

--- a/vp9/vp9_dx_iface.c

+++ b/vp9/vp9_dx_iface.c

@@ -47,12 +47,9 @@

     ctx->priv->init_flags = ctx->init_flags;

     priv->si.sz = sizeof(priv->si);

     priv->flushed = 0;

-    // Only do frame parallel decode when threads > 1.

-    priv->frame_parallel_decode =

-        (ctx->config.dec && (ctx->config.dec->threads > 1) &&

-         (ctx->init_flags & VPX_CODEC_USE_FRAME_THREADING))

-            ? 1

-            : 0;

+    // TODO(jzern): remnants of frame-level parallel decoding should be

+    // removed. cf., https://bugs.chromium.org/p/webm/issues/detail?id=1395

+    priv->frame_parallel_decode = 0;

     if (ctx->config.dec) {

       priv->cfg = *ctx->config.dec;

       ctx->config.dec = &priv->cfg;