Upgrade Blink to milliseconds-based last modified filetimes, part 6.

Upgrade Blink to milliseconds-based last modified filetimes, part 6.

Have content::FileInfoToWebFileInfo() no longer fill in
WebFileInfo::modificationTimeMS; it is now unused by Blink.

Once landed, this lets Blink remove the WebFileInfo field entirely.

This is part 6 in the following patch series,

1: [blink] add WebFileInfo::modificationTimeMS [ https://codereview.chromium.org/873723004/ ]
2: [chromium] fill in modificationTimeMS [ https://codereview.chromium.org/884413002/ ]
3: [blink] make use of modificationTimeMS [ https://codereview.chromium.org/884393002/ ]
4: [chromium] set modificationTime to something msec-based [ https://codereview.chromium.org/862203003/ ]
5: [blink] switch to modificationTime [ https://codereview.chromium.org/882343002/ ]
6: [chromium] *this one* [ https://codereview.chromium.org/890523002/ ]
7: [blink] remove modificationTimeMS [ https://codereview.chromium.org/869613005/ ]

R=jochen
BUG=451747
Committed: https://crrev.com/65e08559dd9b0bc349868a0b954d58f3dc9cae48
Cr-Commit-Position: refs/heads/master@{#315545}

[sof, 2015-02-10 06:17:57]

sigbjornf@opera.com changed reviewers:
+ jam@chromium.org, jochen@chromium.org

[sof, 2015-02-10 06:17:57]

Please take a look.

Final one in content/

[jochen (gone - plz use gerrit), 2015-02-10 10:40:08]

lgtm

[sof, 2015-02-10 11:54:16]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2015-02-10 11:55:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/890523002/1

[commit-bot: I haz the power, 2015-02-10 12:44:42]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-10 12:45:13]

Patchset 1 (id:??) landed as
https://crrev.com/65e08559dd9b0bc349868a0b954d58f3dc9cae48
Cr-Commit-Position: refs/heads/master@{#315545}