Sync the File API interfaces with the spec

Sync the File API interfaces with the spec

https://w3c.github.io/FileAPI/

The only changes to the generated code are due to the encoding->label
rename and [Measure], and neither is observable.

BUG=460722
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=196577

[philipj_slow, 2015-06-04 22:45:43]

philipj@opera.com changed reviewers:
+ jsbell@chromium.org

[philipj_slow, 2015-06-04 22:45:43]

PTAL

[jsbell, 2015-06-04 23:50:54]

lgtm

[philipj_slow, 2015-06-05 13:47:05]

The CQ bit was checked by philipj@opera.com

[philipj_slow, 2015-06-05 13:47:05]

The patchset sent to the CQ was uploaded after l-g-t-m from jsbell@chromium.org
Link to the patchset: https://codereview.chromium.org/1153543012/#ps20001
(title: "rebase")

[commit-bot: I haz the power, 2015-06-05 13:47:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1153543012/20001

[commit-bot: I haz the power, 2015-06-05 14:48:02]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=196577