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CONNECTED and SUB_HEADER are actually never be used while
|use_unified_theme_| is false. This cl goes to remove the unnecessary
logic on |use_unified_theme_|.

May do more refactoring of TrayPopupItemStyle after the simplification.

TEST=IME tray and palette tray do not change visually
(these are the only cases where use_unified_theme_ == false is used.)

Bug: 982950
Change-Id: I71885bbff4b178cf2907e92bc539d0cdf650ce10
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1767095
Commit-Queue: Min Chen <minch@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690108}