GitLab

Have content::FileInfoToWebFileInfo() set the temporarily Blink-unused
field WebFileInfo::modificationTime to something milliseconds-based

Once landed, this is to allow Blink to switch to no longer using
WebFileInfo::modificationTimeMS, but modificationTime only (again.)

This is the fourth patch in the following 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] *this one* [ https://codereview.chromium.org/862203003/ ]
5: [blink] switch to using modificationTime instead of *MS [ https://codereview.chromium.org/882343002/ ]
6: [chromium] stop setting modificationTimeMS [ https://codereview.chromium.org/890523002/ ]
7: [blink] remove modificationTimeMS [ https://codereview.chromium.org/869613005/ ]

R=jochen
BUG=451747

Review URL: https://codereview.chromium.org/862203003

Cr-Commit-Position: refs/heads/master@{#315322}