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The two source, display_util and display_change_observer, needs to
agree on the precise values of DSF so that the correct zoom table
is picked up.

A previous CL crrev.com/c/1815353 did that by consolidating the
constants to 1.77778 and 2.66667. The current CL does the reverse:
use the rounded-down values 1.77777 and 2.66666.

In many places, pixel-to-dip conversion looks to be done by flooring down.
  1920 / 1.777..... = 1080
  floor(1920 / 1.77778) = 1079
  floor(1920 / 1.77777) = 1080
Using a bigger value (1.77778) can cause 1 DIP diff, leading to a strange screen
size (like 1079*674) or bigger errors (b/141898654).

Bug: b/141325696
Bug: b/141898654
Test: screen.width on the devloper console of Krane returns 1080 (not 1079)
Test: chrome settings show multiple choices for display size
Change-Id: I8cbe719b13cd5b6ca5f73bb25c0d27465f6a3e62
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832846Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Kazuhiro Inaba <kinaba@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701492}