[ServiceWorker] Create a new Blob when body.asBody() is called if the size of body is not set.

[ServiceWorker] Create a new Blob when body.asBody() is called if the size of body is not set.

This patch fixes the wrong size of blob which can be get by calling FetchEvent.request.body.asBody() of the fetch event which body includes a file item.

This change depends on https://codereview.chromium.org/517543002.


BUG=402387
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181077

[horo, 2014-08-28 11:40:33]

Patchset #1 (id:1) has been deleted

[horo, 2014-08-28 11:57:39]

Patchset #1 (id:20001) has been deleted

[horo, 2014-08-28 12:02:28]

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

[horo, 2014-08-28 12:02:28]

michaeln@
Could you please review?

[michaeln, 2014-08-28 22:53:54]

lgtm

[horo, 2014-08-29 04:23:59]

The CQ bit was checked by horo@chromium.org

[commit-bot: I haz the power, 2014-08-29 04:24:23]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/horo@chromium.org/514113003/40001

[commit-bot: I haz the power, 2014-08-29 05:39:46]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/24767)

[commit-bot: I haz the power, 2014-08-29 06:26:41]

Committed patchset #1 (id:40001) as 181077