Revert of Add support for 9- and 10-bit h264 videos. (patchset #27 of https://codereview.chromium.org/1599533002/ )

Reason for revert:

Commit was failing content_browsertests on Mac 10.10:
failures:
Http/MediaTest.VideoBearHighBitDepthMp4/0
File/MediaTest.VideoBearHighBitDepthMp4/0

First failure:
https://build.chromium.org/p/chromium.mac/builders/Mac10.10%20Tests/builds/5222

Original issue's description:
> Add support for 9- and 10-bit h264 videos.
>
> Videos are uploaded to GPU using half-floats if supported, otherwise
> they are downshifted to regular 8-bit textures before uploading. No
> dithering is done, except for whatever GL_DITHER might do. (Which
> is probably nothing.)
>
> BUG=445071
> CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
>
> Committed: https://crrev.com/074c4287f2625860b2a9eb437b97f1f1788f8f4b
> Cr-Commit-Position: refs/heads/master@{#373691}

TBR=fbarchard@chromium.org,erg@chromium.org,reed@chromium.org,piman@chromium.org,danakj@chromium.org,asvitkine@chromium.org,dalecurtis@chromium.org,nasko@chromium.org,fsamuel@chromium.org
BUG=445071
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1674703002

Cr-Commit-Position: refs/heads/master@{#373824}

1 files changed, 0 insertions, 1 deletions

diff --git a/cc/raster/tile_task_worker_pool.cc b/cc/raster/tile_task_worker_pool.cc
index d4549c7..668aa66 100644
--- a/cc/raster/tile_task_worker_pool.cc
+++ b/cc/raster/tile_task_worker_pool.cc
@@ -50,7 +50,6 @@ bool IsSupportedPlaybackToMemoryFormat(ResourceFormat format) {
     case RGB_565:
     case ETC1:
     case RED_8:
-    case LUMINANCE_F16:
       return false;
   }
   NOTREACHED();