Revert of Add compressed texture capabilities for GPU devices

Revert of Add compressed texture capabilities for GPU devices (https://codereview.chromium.org/292323003/)

Reason for revert:
Signeness comparison breaks build. After working some more, I think the API design will be cleaner without the Uncompressed enum, so I'm removing it and retesting everything.

Original issue's description:
> Add compressed texture capabilities for GPU devices
> 
> BUG=skia:
> 
> Committed: http://code.google.com/p/skia/source/detail?r=14880

TBR=bsalomon@google.com,robertphillips@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: http://code.google.com/p/skia/source/detail?r=14883

[krajcevski, 2014-05-23 20:17:03]

Created Revert of Add compressed texture capabilities for GPU devices

[commit-bot: I haz the power, 2014-05-23 20:17:26]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/krajcevski@google.com/296313003/1

[commit-bot: I haz the power, 2014-05-23 20:17:27]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-05-23 20:17:27]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[hal.canary, 2014-05-23 20:39:38]

lgtm

[hal.canary, 2014-05-23 20:39:56]

The CQ bit was checked by halcanary@google.com

[commit-bot: I haz the power, 2014-05-23 20:40:20]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/krajcevski@google.com/296313003/1

[commit-bot: I haz the power, 2014-05-23 20:40:29]

Change committed as 14883