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Move classes related to text styles inside the dialog.
Use host-context to check the orientation so the minimum number of CSS
vars are set outside of the object.

Bug: 1151292
Change-Id: Ic372098d24dc4af123d5b6ee737b970d3959ae34
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593631Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Roman Aleksandrov <raleksandrov@google.com>
Cr-Commit-Position: refs/heads/master@{#837597}