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Previously, TrayPopupItemStyle colors are just switched by the flag
--enable-features=SystemTrayUnified. However, we had some other tray
bubbles (PaletteTray and ImeMenuTray) that use TrayPopupItemStyle,
and in these places we don't want the colors to be changed.

To prevent this, we add |use_unified_theme| flag to TrayPopupItemStyle,
and explicitly set false in PaletteTray and ImeMenuTray.

TEST=manual
BUG=847319

Change-Id: I183f9b9ddaca1adf2063b7e40bef9438c451ae48
Reviewed-on: https://chromium-review.googlesource.com/1075844Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563167}