Update font preference to use Noto Sans CJK on CrOS

Update font preference to use Noto Sans CJK on CrOS

Noto Sans CJK is a new set of CJK fonts released by Google and Adobe on
July 11. They have been developed with the harmony with Noto Sans (LGC)
to be used together. For CJK, we don't need to use licensed fonts, 3rd
party fonts, or Droid Sans Fallback any more.

While I'm at it, replace 'Open Sans' (that CrOS deviced do not have)
with 'Noto Sans UI' (the default UI font on CrOS for
Latin-Greek-Cyrillic) and remove a reference to 'Droid Sans Fallback'
(that is going to be removed in a separate CrOS CL).

This CL will go in after the CrOS CL to add Noto Sans CJK is landed. (  https://chromium-review.googlesource.com/212624 )

BUG=399080
TEST=Start CrOS in 4 CJK locales and see the fonts set (noto Sans CJK <lang>) here are used.
TBR=derat@chromium.org, sky@chromium.org

Review URL: https://codereview.chromium.org/476123002

Cr-Commit-Position: refs/heads/master@{#290138}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290138 0039d316-1c4b-4281-b951-d872f2087c98
(cherry picked from commit db681ab00427e68df6ac524e711e6d13f7efff6f)

Committed to pending queue: https://chromium.googlesource.com/chromium/src/+/304e59b

[jungshik at Google, 2014-08-26 16:55:03]

Committed patchset #2 to pending queue manually as 304e59b (presubmit
successful).

[Daniel Erat, 2014-08-26 17:03:46]

lgtm