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Re-introduce frame size check inadvertantly deleted

This patch adds back in code that checks that the frame
size lies within defined bounds was inadvertantly removed
by a previous patch:
https://gerrit.chromium.org/gerrit/#/c/70814/

Change-Id: If526570ba559260c4b7e98098bc75f7700ae7f97

--- a/vp9/decoder/vp9_decodeframe.c

+++ b/vp9/decoder/vp9_decodeframe.c

@@ -621,6 +621,11 @@

 }

 static void resize_context_buffers(VP9_COMMON *cm, int width, int height) {

+#if CONFIG_SIZE_LIMIT

+  if (width > DECODE_WIDTH_LIMIT || height > DECODE_HEIGHT_LIMIT)

+    vpx_internal_error(&cm->error, VPX_CODEC_CORRUPT_FRAME,

+                       "Width and height beyond allowed size.");

+#endif

   if (cm->width != width || cm->height != height) {

     // Change in frame size (assumption: color format does not change).

     if (cm->width == 0 || cm->height == 0 ||