SkPDF: Move SkFlate into src/pdf (part 3/3)

SkPDF: Move SkFlate into src/pdf (part 3/3)

This must land after http://crrev.com/1288053002

Motivation: Skia only uses SkFlate in the SkPDF module.

Committed: https://skia.googlesource.com/skia/+/f5fb939867405eabdeaff6e10948d9dd9317d1b5

[hal.canary, 2015-08-12 15:37:30]

halcanary@google.com changed reviewers:
+ bungeman@google.com

[hal.canary, 2015-08-12 15:37:31]

PTAL

[reed1, 2015-08-12 15:46:59]

reed@google.com changed reviewers:
+ reed@google.com

[reed1, 2015-08-12 15:47:00]

lgtm

[hal.canary, 2015-08-14 18:17:33]

The CQ bit was checked by halcanary@google.com to run a CQ dry run

[commit-bot: I haz the power, 2015-08-14 18:17:41]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1288063002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1288063002/20001

[commit-bot: I haz the power, 2015-08-14 18:24:43]

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

[commit-bot: I haz the power, 2015-08-14 18:24:44]

Dry run: This issue passed the CQ dry run.

[hal.canary, 2015-08-14 18:25:47]

The CQ bit was checked by halcanary@google.com

[hal.canary, 2015-08-14 18:25:48]

The patchset sent to the CQ was uploaded after l-g-t-m from reed@google.com
Link to the patchset: https://codereview.chromium.org/1288063002/#ps20001
(title: "2015-08-12 (Wednesday) 18:23:41 EDT")

[commit-bot: I haz the power, 2015-08-14 18:26:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1288063002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1288063002/20001

[commit-bot: I haz the power, 2015-08-14 18:26:36]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/f5fb939867405eabdeaff6e10948d9dd9317d1b5