[cleanup] Make Scope implementation private, remove dead friend declaration

[cleanup] Make Scope implementation private, remove dead friend declaration

Scope has no subclasses, so "protected" should just be "private". And
there is no ParserFactory class, so making it a friend doesn't buy us
anything.

Committed: https://crrev.com/a0d119c766f6d31eb51def269dfc01c302560c7c
Cr-Commit-Position: refs/heads/master@{#31201}

[adamk, 2015-10-09 21:19:06]

adamk@chromium.org changed reviewers:
+ littledan@chromium.org

[Dan Ehrenberg, 2015-10-09 21:19:44]

lgtm

[adamk, 2015-10-09 21:22:46]

The CQ bit was checked by adamk@chromium.org

[commit-bot: I haz the power, 2015-10-09 21:22:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1393303005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1393303005/1

[commit-bot: I haz the power, 2015-10-09 21:41:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-09 21:42:05]

Patchset 1 (id:??) landed as
https://crrev.com/a0d119c766f6d31eb51def269dfc01c302560c7c
Cr-Commit-Position: refs/heads/master@{#31201}