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This is a reland of crrev.com/c/1882249 because the path
names of some -expected.png were too long on Windows.

* 3 crashes in native-file-system.
* Mostly image rebaselines where scrollbar buttons became
  grayed when the scroll position is at begin/end. Probably
  someone fixed this.
* A few pixel differences in rendering fonts, for vertical
  flow and "AM" in the date picker.

TBR=ikilpatrick@chromium.org

Change-Id: If1d67fb4a9d496c564bfe6246cc57e46288c565b
Bug: 1018587
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1882259
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709800}