Move Pickle to base namespace.

Move Pickle to base namespace.

Updates forward-declares and headers, but keeps a using statement in to avoid updating all users atomically.

TBR=jschuh for IPC stuff

Committed: https://crrev.com/05cfd8ddb3849b7e11bb53e199064291a52aeea9
Cr-Commit-Position: refs/heads/master@{#332352}

[brettw, 2015-06-01 18:27:42]

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

[brettw, 2015-06-01 18:27:51]

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

[commit-bot: I haz the power, 2015-06-01 18:29:50]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1149113006/1

[commit-bot: I haz the power, 2015-06-01 19:06:05]

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

[commit-bot: I haz the power, 2015-06-01 19:06:08]

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, 2015-06-01 19:14:13]

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

[sky, 2015-06-01 19:14:53]

Rubber stamp LGTM

[commit-bot: I haz the power, 2015-06-01 19:16:22]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1149113006/20001

[brettw, 2015-06-01 19:16:36]

The CQ bit was unchecked by brettw@chromium.org

[brettw, 2015-06-01 19:16:42]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2015-06-01 19:22:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1149113006/20001

[commit-bot: I haz the power, 2015-06-01 19:32:20]

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

[commit-bot: I haz the power, 2015-06-01 19:32:22]

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, 2015-06-01 19:59:07]

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

[brettw, 2015-06-01 19:59:22]

The CQ bit was checked by brettw@chromium.org

[brettw, 2015-06-01 19:59:23]

The patchset sent to the CQ was uploaded after l-g-t-m from sky@chromium.org
Link to the patchset: https://codereview.chromium.org/1149113006/#ps40001
(title: " ")

[commit-bot: I haz the power, 2015-06-01 20:03:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1149113006/40001

[commit-bot: I haz the power, 2015-06-01 21:27:24]

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

[commit-bot: I haz the power, 2015-06-01 21:27:27]

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

[brettw, 2015-06-01 21:33:29]

The CQ bit was checked by brettw@chromium.org

[brettw, 2015-06-01 21:33:30]

The patchset sent to the CQ was uploaded after l-g-t-m from sky@chromium.org
Link to the patchset: https://codereview.chromium.org/1149113006/#ps60001
(title: " ")

[commit-bot: I haz the power, 2015-06-01 21:34:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1149113006/60001

[commit-bot: I haz the power, 2015-06-02 00:59:40]

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

[commit-bot: I haz the power, 2015-06-02 00:59:43]

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

[brettw, 2015-06-02 04:22:06]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2015-06-02 04:22:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1149113006/60001

[brettw, 2015-06-02 05:45:53]

The CQ bit was unchecked by brettw@chromium.org

[brettw, 2015-06-02 05:46:01]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2015-06-02 05:46:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1149113006/60001

[commit-bot: I haz the power, 2015-06-02 07:02:58]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-06-02 07:03:55]

Patchset 4 (id:??) landed as
https://crrev.com/05cfd8ddb3849b7e11bb53e199064291a52aeea9
Cr-Commit-Position: refs/heads/master@{#332352}