Revert "Experimental SkVideoDecoder, to wrap calls to ffmpeg"

This reverts commit 69596470d1e9cdff9b4a7cb202a3791b474d9be9.

Reason for revert: breaks google3 roll
third_party/skia/HEAD/gm/video_decoder.cpp:8:10: fatal error: 'experimental/ffmpeg/SkVideoDecoder.h' file not found
#include "experimental/ffmpeg/SkVideoDecoder.h"

Original change's description:
> Experimental SkVideoDecoder, to wrap calls to ffmpeg
> 
> If you want to build ffmpeg locally, here is how I configured it:
> ./configure --disable-all --enable-avcodec --enable-avformat --enable-decoder=h264 --enable-parser=h264 --enable-demuxer=mov --enable-static --enable-protocol=file
> 
> Bug: skia: 9085
> Change-Id: If1892b62314af26e56ecb0293850f7554106c3d0
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/213664
> Commit-Queue: Mike Reed <reed@google.com>
> Reviewed-by: Nathaniel Nifong <nifong@google.com>

TBR=mtklein@google.com,bsalomon@google.com,scroggo@google.com,brianosman@google.com,fmalita@chromium.org,reed@google.com,nifong@google.com

Change-Id: I33d68e11a67ccf3616296e3377b42438c7f95edc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia: 9085
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/214441
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
4 files changed