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http://crbug.com/982375:
The callback onCloseMenu_() is only defined in the language page
JavaScript file in CrOS and Windows however it is bound as a callback
in the HTML file regardless of the OS, causing console warnings [1].

http://crbug.com/982390:
Also, the private functions section of the language_page's JS [1] is
complicated unnecessarily by OS specific blocks for the same
conditions that are separated for no logical reason.

The first patchset in this CL consolidates the OS specific blocks of
complete private methods (i.e. fixes http://crbug.com/982390). The
second patch set prevents the onCloseMenu_() callback from being bound
unless the OS is CrOS or window (i.e. fixes http://crbug.com/982375).

[1] https://imgur.com/a/O5IFCE4

Bug: 982375, 982390
Change-Id: Ic72e7f0e8e1d1680907b4ab8aa99b45f221e4575
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1693385Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: May Lippert <maybelle@chromium.org>
Commit-Queue: Jordy Greenblatt <jordynass@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675847}