Move Tuple to base namespace.

Move Tuple to base namespace.

Namespace change only, no functionality change.

The only non-search-and-replace change is in generate_gmock_mutant.py which changes some line wrapping logic for the generated gmock_mutant header.

NOPRESUBMIT=true
(No presubmit due to long lines in the generated gmock_mutant.h header).
R=sky

Committed: https://crrev.com/d5ca2bc110d2bcf78dbfafc8b4f8d69663594e77
Cr-Commit-Position: refs/heads/master@{#332058}

[brettw, 2015-05-29 19:41:43]

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

[commit-bot: I haz the power, 2015-05-29 19:41:59]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1159553007/20001

[brettw, 2015-05-29 19:42:26]

brettw@chromium.org changed reviewers:
+ sky@chromium.org

[commit-bot: I haz the power, 2015-05-29 19:53:49]

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

[commit-bot: I haz the power, 2015-05-29 19:53:53]

Dry run: 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...)

[brettw, 2015-05-29 20:41:44]

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

[commit-bot: I haz the power, 2015-05-29 20:43:58]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1159553007/40001

[sky, 2015-05-29 20:46:55]

LGTM

[brettw, 2015-05-29 20:54:22]

The CQ bit was unchecked by brettw@chromium.org

[brettw, 2015-05-29 20:54:28]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2015-05-29 20:54:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1159553007/40001

[commit-bot: I haz the power, 2015-05-29 22:16:15]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-05-29 22:17:06]

Patchset 3 (id:??) landed as
https://crrev.com/d5ca2bc110d2bcf78dbfafc8b4f8d69663594e77
Cr-Commit-Position: refs/heads/master@{#332058}