Pull cacheinvalidations code directory into chromium repo.

Pull cacheinvalidations code directory into chromium repo.

Code.google.com is being turned down, and cacheinvalidation is still necessary
for Chromium, and depends on base/. Pull it directly into the chromium repo to
preserve it and ensure any changes to base/ that conflict with the
cacheinvalidation code are caught at compile time.

BUG=472898
Committed: https://crrev.com/4a996cdc7a36a71ac511c153375fc6170fea80e6
Cr-Commit-Position: refs/heads/master@{#332636}

[Nicolas Zea, 2015-06-02 23:46:34]

zea@chromium.org changed reviewers:
+ dcheng@chromium.org

[Nicolas Zea, 2015-06-02 23:46:35]

+Daniel, PTAL. Everything was just pulled in directly. Although the README
states it was at 341, the DEPS had actually been updated to 342 so this is
already the newest version, and that's what I updated the README to mention.

[dcheng, 2015-06-03 01:38:49]

lgtm

[Nicolas Zea, 2015-06-03 01:45:21]

The CQ bit was checked by zea@chromium.org

[commit-bot: I haz the power, 2015-06-03 01:46:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1162033004/1

[commit-bot: I haz the power, 2015-06-03 01:58:31]

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

[commit-bot: I haz the power, 2015-06-03 01:58:33]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[Nicolas Zea, 2015-06-03 17:20:06]

zea@chromium.org changed reviewers:
+ danakj@chromium.org

[Nicolas Zea, 2015-06-03 17:20:07]

+danakj for base/ dependency. This folder no longer pulls in an external repo,
and always actually depended on base/ to begin with.

[danakj, 2015-06-03 17:40:07]

LGTM

[Nicolas Zea, 2015-06-03 17:40:34]

The CQ bit was checked by zea@chromium.org

[commit-bot: I haz the power, 2015-06-03 17:41:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1162033004/1

[commit-bot: I haz the power, 2015-06-03 17:51:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-03 17:52:44]

Patchset 1 (id:??) landed as
https://crrev.com/4a996cdc7a36a71ac511c153375fc6170fea80e6
Cr-Commit-Position: refs/heads/master@{#332636}