[ServiceWorker] Move skip_service_worker flag from RequestExtraData to RequestInfo.

[ServiceWorker] Move skip_service_worker flag from RequestExtraData to RequestInfo.

skip_service_worker flag was introduced in https://codereview.chromium.org/527713002/.
But setting this flag of RequestExtraData in RenderFrameImpl::willSendRequest() is looks weird.
This flag should be in RequestInfo and should be set in WebURLLoaderImpl::Context::Start.

BUG=402093
Committed: https://crrev.com/daca1be7b574c7511d6ef6f625c5bf7e8d4e6d42
Cr-Commit-Position: refs/heads/master@{#294151}

[horo, 2014-09-07 08:49:56]

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

[horo, 2014-09-07 08:49:57]

jochen@
Could you please review this?

[jochen (gone - plz use gerrit), 2014-09-10 08:16:27]

lgtm

[horo, 2014-09-10 08:38:59]

The CQ bit was checked by horo@chromium.org

[commit-bot: I haz the power, 2014-09-10 08:39:40]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/horo@chromium.org/547213002/1

[commit-bot: I haz the power, 2014-09-10 09:37:56]

Committed patchset #1 (id:1) as ebb815f1c3ab7e84ec5e1c139bc98fd0b0c16dde

[commit-bot: I haz the power, 2014-09-10 10:56:20]

Patchset 1 (id:??) landed as
https://crrev.com/daca1be7b574c7511d6ef6f625c5bf7e8d4e6d42
Cr-Commit-Position: refs/heads/master@{#294151}