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Reland "Misc. cleanup to browser_theme_pack_unittest.cc; no functional change."

This is a reland of ec2cd434

Original change's description:
> Misc. cleanup to browser_theme_pack_unittest.cc; no functional change.
>
> * Add GetDefaultColor() mapping function to make it easy to fix DCHECKs due to
>   this code using raw _INCOGNITO color constants but
>   ThemeProperties::GetDefaultColor() not expecting them.  This is the change
>   that led me to get annoyed and do all the other stuff here.
> * Convert typedefs to type aliases.
> * Add TP = ThemeProperties type alias for brevity.
> * Use =default.
> * Mark functions that don't touch member variables "static".
> * Fix wrapping issues.
> * Because the class here is so long, split it into declaration and definition
>   pieces so it's easier to see what's the API and what's helper functions.
> * Make the API protected; make helpers private.
> * Make data members private.  Add a const accessor for the one member tests use.
>
> Bug: none
> Change-Id: I4cc058bb29747cfa84835edbc5ce765401e14527
> Reviewed-on: https://chromium-review.googlesource.com/1152108
> Reviewed-by: Evan Stade <estade@chromium.org>
> Commit-Queue: Peter Kasting <pkasting@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#578775}

Bug: none
Change-Id: I0a6e9543722f886c2528700e457fd0ef0d75dccd
TBR: estade
Reviewed-on: https://chromium-review.googlesource.com/1154147Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578886}