A bit of misc cleanup.

A bit of misc cleanup.

 - Update comments about skia_shared_lib
 - Remove dead code (system_preferences)
 - Remove non-building code (techtalk1)
 - Turn gm/annotated_text back on.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/9a106ba2dd68ced8f6556e99ba211a37439a03bb

[mtklein_C, 2015-08-14 14:43:32]

The CQ bit was checked by mtklein@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-08-14 14:43:45]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1286133004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1286133004/1

[mtklein_C, 2015-08-14 14:48:14]

mtklein@chromium.org changed reviewers:
+ halcanary@google.com

[commit-bot: I haz the power, 2015-08-14 14:50:38]

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

[commit-bot: I haz the power, 2015-08-14 14:50:39]

Dry run: This issue passed the CQ dry run.

[hal.canary, 2015-08-14 17:02:56]

The CQ bit was checked by halcanary@google.com

[hal.canary, 2015-08-14 17:02:56]

lgtm

[commit-bot: I haz the power, 2015-08-14 17:03:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1286133004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1286133004/1

[commit-bot: I haz the power, 2015-08-14 17:03:49]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/9a106ba2dd68ced8f6556e99ba211a37439a03bb