Move ServiceAccessType into //components/keyed_service

Move ServiceAccessType into //components/keyed_service

The ServiceAccessType is only used when interacting with
KeyedServiceFactories so move it into the keyed_service
components.

Turn the enumeration into a "class enum" so that the value
names don't leak into the global namespace.

Fix client code and add missing #include after changing the
chrome/browser/profiles/profile.h #include into forward
declaration in the KeyedServiceFactories headers.

Usage of the enumeration was fixed using tools/git/mffr.py.

BUG=419366
Committed: https://crrev.com/e9ea3c2ead117e0945df3c9d64c202477fffc99c
Cr-Commit-Position: refs/heads/master@{#310979}

[sdefresne, 2015-01-09 09:56:57]

sdefresne@chromium.org changed reviewers:
+ droger@chromium.org, erg@chromium.org

[sdefresne, 2015-01-09 09:58:02]

sdefresne@chromium.org changed reviewers:
+ jochen@chromium.org

[sdefresne, 2015-01-09 10:01:08]

sdefresne@chromium.org changed reviewers:
- droger@chromium.org

[sdefresne, 2015-01-09 10:01:10]

The interesting changes are in:
- components/keyed_service.gypi
- components/keyed_service/core/BUILD.gn
- components/keyed_service/core/service_access_type.h
- chrome/browser/profiles/profile.h

All the rest is just mechanical changes resulting from running
"tools/git/mffr.py" and then using "git cl format" to reformat the lines that
were > 80 characters.

erg: please take a look at the keyed_service and profile changes

jochen: adding as OWNERS of the impacted client code, will TBR those changes as
they are just mechanical if erg approves them

[jochen (gone - plz use gerrit), 2015-01-09 13:04:35]

lgtm assuming erg reviews this as well

[Elliot Glaysher, 2015-01-09 18:21:13]

lgtm

[sdefresne, 2015-01-10 09:05:29]

The CQ bit was checked by sdefresne@chromium.org

[commit-bot: I haz the power, 2015-01-10 09:05:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/839193002/20001

[commit-bot: I haz the power, 2015-01-10 10:10:40]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-01-10 10:11:19]

Patchset 2 (id:??) landed as
https://crrev.com/e9ea3c2ead117e0945df3c9d64c202477fffc99c
Cr-Commit-Position: refs/heads/master@{#310979}