Remove unused in-process pepper APIs

Remove unused in-process pepper APIs

Several APIs are now unused after turning on OOP PDF. This removes:
Selection_Dev
Widget_Dev
Scrollbar_Dev
Zoom_Dev

These APIs only work in-process so we can be sure they aren't used by existing plugins (except possibly the NaCl plugin but they aren't used by that either).

BUG=303491
Committed: https://crrev.com/994380bfb0056cd5744ead4e7d5018bc17542235
Cr-Commit-Position: refs/heads/master@{#331904}

[raymes, 2015-05-27 03:17:54]

raymes@chromium.org changed reviewers:
+ bbudge@chromium.org

[raymes, 2015-05-27 03:18:03]

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

[commit-bot: I haz the power, 2015-05-27 03:18:15]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1161563002/1

[commit-bot: I haz the power, 2015-05-27 05:35:36]

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

[commit-bot: I haz the power, 2015-05-27 05:35:38]

Dry run: This issue passed the CQ dry run.

[bbudge, 2015-05-27 07:14:37]

LGTM = looks great to me.

[raymes, 2015-05-28 00:43:49]

raymes@chromium.org changed reviewers:
+ binji@chromium.org, thestig@chromium.org

[raymes, 2015-05-28 00:43:50]

+OWNERS

+binji for native_client_sdk/*
+thestig for trivial changes to chrome/common/ppapi_utils.cc

[Lei Zhang, 2015-05-28 00:58:42]

chrome/ lgtm

[binji, 2015-05-28 17:52:59]

native_client_sdk lgtm

[raymes, 2015-05-28 23:34:53]

The CQ bit was checked by raymes@chromium.org

[commit-bot: I haz the power, 2015-05-28 23:35:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1161563002/1

[commit-bot: I haz the power, 2015-05-29 01:32:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-29 01:32:51]

Patchset 1 (id:??) landed as
https://crrev.com/994380bfb0056cd5744ead4e7d5018bc17542235
Cr-Commit-Position: refs/heads/master@{#331904}