Upgrade Blink to milliseconds-based last modified filetimes, part 2.

With WebFileInfo::modificationTimeMS now available, have
content::FileInfoToWebFileInfo() set it accordingly and alongside
modificationTime.

1: [blink] add WebFileInfo::modificationTimeMS [ https://codereview.chromium.org/873723004/ ]
2: [chromium] *this one* [ 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 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=kinuko,jam
BUG=451747

Review URL: https://codereview.chromium.org/884413002

Cr-Commit-Position: refs/heads/master@{#314214}
1 file changed