Drop [LegacyInterfaceTypeChecking] for HTMLInputElement.prototype.files

Drop [LegacyInterfaceTypeChecking] for HTMLInputElement.prototype.files

The setter is non-standard, but if it is standardized it wouldn't make
sense to have the existing behavior. For any case that this starts
throwing there's a programming error, so unless it breaks the web it
should throw TypeError.

BUG=561338
Committed: https://crrev.com/c4a4737016177ece7b8f9d607d436eb2838d2365
Cr-Commit-Position: refs/heads/master@{#362689}

[philipj_slow, 2015-12-02 10:00:44]

The CQ bit was checked by philipj@opera.com to run a CQ dry run

[commit-bot: I haz the power, 2015-12-02 10:01:01]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1492523003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1492523003/20001

[commit-bot: I haz the power, 2015-12-02 11:53:09]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-12-02 11:53:10]

Dry run: This issue passed the CQ dry run.

[philipj_slow, 2015-12-02 12:26:08]

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

[philipj_slow, 2015-12-02 12:26:08]

PTAL and CQ?

[jochen (gone - plz use gerrit), 2015-12-02 12:30:19]

The CQ bit was checked by jochen@chromium.org

[jochen (gone - plz use gerrit), 2015-12-02 12:30:20]

lgtm

[commit-bot: I haz the power, 2015-12-02 12:30:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1492523003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1492523003/20001

[commit-bot: I haz the power, 2015-12-02 12:34:05]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-12-02 12:34:45]

Description was changed from

==========
Drop [LegacyInterfaceTypeChecking] for HTMLInputElement.prototype.files

The setter is non-standard, but if it is standardized it wouldn't make
sense to have the existing behavior. For any case that this starts
throwing there's a programming error, so unless it breaks the web it
should throw TypeError.

BUG=561338
==========

to

==========
Drop [LegacyInterfaceTypeChecking] for HTMLInputElement.prototype.files

The setter is non-standard, but if it is standardized it wouldn't make
sense to have the existing behavior. For any case that this starts
throwing there's a programming error, so unless it breaks the web it
should throw TypeError.

BUG=561338

Committed: https://crrev.com/c4a4737016177ece7b8f9d607d436eb2838d2365
Cr-Commit-Position: refs/heads/master@{#362689}
==========

[commit-bot: I haz the power, 2015-12-02 12:34:46]

Patchset 2 (id:??) landed as
https://crrev.com/c4a4737016177ece7b8f9d607d436eb2838d2365
Cr-Commit-Position: refs/heads/master@{#362689}