Remove the in-process PDF viewer from pdf/

Remove the in-process PDF viewer from pdf/

BUG=303491
Committed: https://crrev.com/a865c1dc8cdb0b0d0e5efab76623f1f5c23f6119
Cr-Commit-Position: refs/heads/master@{#328498}

[raymes, 2015-05-06 05:47:10]

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

[raymes, 2015-05-06 05:47:11]

There are is a bunch of other code which can also be removed but I will do it
over a few CLs :)

[raymes, 2015-05-06 05:49:03]

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

[commit-bot: I haz the power, 2015-05-06 05:49:25]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1125103002/1

[Sam McNally, 2015-05-06 05:56:30]

LGTM

[Lei Zhang, 2015-05-06 06:33:36]

lgtm, yay!

[commit-bot: I haz the power, 2015-05-06 06:47:48]

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

[commit-bot: I haz the power, 2015-05-06 06:47:49]

Dry run: This issue passed the CQ dry run.

[raymes, 2015-05-06 07:03:57]

The CQ bit was checked by raymes@chromium.org

[commit-bot: I haz the power, 2015-05-06 07:04:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1125103002/1

[commit-bot: I haz the power, 2015-05-06 07:07:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-06 07:08:48]

Patchset 1 (id:??) landed as
https://crrev.com/a865c1dc8cdb0b0d0e5efab76623f1f5c23f6119
Cr-Commit-Position: refs/heads/master@{#328498}