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Move assigment operator in ui::ColorSet is noexcept. Because this
class has a member of type base::flat_map, move assignment operators
of base::flat_map and base::flat_tree must be noexcept too.
base::flat_tree noexcept is conditional to avoid build failure with
NaCl.

Otherwise GCC fails like this:

../../ui/color/color_set.cc:14:11: error: function
'ui::ColorSet& ui::ColorSet::operator=(ui::ColorSet&&)' defaulted on its
redeclaration with an exception-specification that differs from the
implicit exception-specification ''
   14 | ColorSet& ColorSet::operator=(ColorSet&&) noexcept = default;
      |           ^~~~~~~~

Bug: 819294
Change-Id: I10ce31851effc9ce78f2b5cbbb7148c339f065a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2179245
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772175}