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https://crrev.com/809702 added a global constant to
ambient_background_image_view.cc, but the constant adds a static
initializer. Avoid this by making the constant local to the method it is
used in. Then it is initialized on first use instead.

Bug: 537099
Change-Id: I1724e5a563e1a30a6aa6c8b306626ec86f6a570a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427549Reviewed-by: Tao Wu <wutao@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810037}