Revert of Add accelerated video decoder interface, VP8 and H.264 implementations and hook up to V4L2SVDA

Revert of Add accelerated video decoder interface, VP8 and H.264 implementations and hook up to V4L2SVDA (patchset #1 id:20001 of https://codereview.chromium.org/813693006/)

Reason for revert:
This is breaking arm builds. See for example:

https://build.chromium.org/p/chromiumos.chromium/builders/Daisy%20%28chromium%29/builds/4129/steps/cbuildbot/logs/stdio

Original issue's description:
> Reland: Add accelerated video decoder interface, VP8 and H.264 implementations and hook up to V4L2SVDA.
>
> This is a reland as the previous CL has an issue with BUILD.gn and failed gn build.
>
> An AcceleratedVideoDecoder is a video decoder that requires support from an
> external accelerator (typically a hardware accelerator) to partially
> offload the decode process after parsing stream headers, and performing
> reference frame and state management.
>
> In this design, the hardware-independent decoder implementation interfaces
> with a HW-specific Accelerator to offload last stages of the decode process.
>
> Add the interface for AcceleratedVideoDecoder, decoders for VP8 and H264,
> V4L2-specific Accelerators for VP8 and H264 and a common accelerator/client
> class for V4L2.
>
> TEST=vdatest VP8/H264, mp4 local video playback, apprtc decode
> BUG=chrome-os-partner:33728
> TBR=wuchengli@chromium.org,kcwu@chromium.org,owenlin@chromium.org,xhwang@chromium.org,scherkus@chromium.org,dalecurtis@chromium.org
>
> Committed: https://crrev.com/3c09b9b26ee6fc8b43c7535070cfa08aba1285cf
> Cr-Commit-Position: refs/heads/master@{#311464}

TBR=wuchengli@chromium.org,kcwu@chromium.org,owenlin@chromium.org,xhwang@chromium.org,scherkus@chromium.org,dalecurtis@chromium.org,posciak@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=chrome-os-partner:33728
Committed: https://crrev.com/e69d5cb6c3076d61c4f86677987cca579c968af4
Cr-Commit-Position: refs/heads/master@{#311561}

[Ken Rockot(use gerrit already), 2015-01-14 22:34:17]

Created Revert of Add accelerated video decoder interface, VP8 and H.264
implementations and hook up to V4L2SVDA