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This reverts commit 248bfd1f.

Reason for revert: Broke some Android WebGL video tests

BUG=1047201

Original change's description:
> Don't create manager objects in ContextGroup when using the passthrough decoder
> 
> These objects are not used when the passthrough command decoder is in
> use.  This saves several GPU memory allocations in TextureManager for
> default and black textures.
> 
> Saves ~2 MB per context.
> 
> BUG=1046613
> BUG=1030835
> 
> Change-Id: I66c6acf28580742bc313d8cf79de80f7f7d98305
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028291
> Commit-Queue: Geoff Lang <geofflang@chromium.org>
> Reviewed-by: Zhenyao Mo <zmo@chromium.org>
> Reviewed-by: Dan Sanders <sandersd@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#736631}

TBR=zmo@chromium.org,geofflang@chromium.org,sandersd@chromium.org

Change-Id: I82ca36bd0b449e743ef819fbfe6ad161b219a8d0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1046613, 1030835
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031164Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736863}