Delete obsolete GPU rasterization content whitelist code

Delete obsolete GPU rasterization content whitelist code

This deletes code that was previously used for deciding if the
expanded content whitelist for GPU rasterization should be used.
Blink now uses the expanded whitelist by default (that is,
WebSettings::setUseExpandedHeuristicsForGpuRasterization is
now a no-op), so this code is no longer needed.

BUG=404866
Committed: https://crrev.com/4739a2c57d5f288aadcd91b7236de25b7dfd8825
Cr-Commit-Position: refs/heads/master@{#291744}

[ajuma, 2014-08-22 16:03:51]

creis: please review content/
zmo: please review gpu/

[Charlie Reis, 2014-08-22 16:17:44]

content/ LGTM

[Charlie Reis, 2014-08-22 16:18:56]

[+nasko]

Looks like you may need an IPC owner's review for
content/public/common/common_param_traits_macros.h, as well.

[nasko, 2014-08-22 16:31:25]

IPC LGTM

[Zhenyao Mo, 2014-08-25 18:16:41]

LGTM

[ajuma, 2014-08-25 18:52:07]

The CQ bit was checked by ajuma@chromium.org

[commit-bot: I haz the power, 2014-08-25 18:52:56]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ajuma@chromium.org/496503002/20001

[commit-bot: I haz the power, 2014-08-25 19:46:48]

Committed patchset #1 (20001) as 67f5cf238b439f71d69661c8fad766ae6c0f712a

[commit-bot: I haz the power, 2014-09-10 02:36:57]

Patchset 1 (id:??) landed as
https://crrev.com/4739a2c57d5f288aadcd91b7236de25b7dfd8825
Cr-Commit-Position: refs/heads/master@{#291744}