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The free function GetFallbackImageWithStringAndColor was defined
in the middle of the @implementation part of BaseSpotlightManager
which is confusing (as one would expect to see only methods for
the class defined there).

Move the free function to an anonymous namespace and out of the
class @implementation/@interface parts to make it clearer that
it is not in fact a class method.

Bug: none
Change-Id: Iacc46d73217fa8ca65867150f729fcfdf4fed3ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2388320
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803567}