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This CL moves the logic where we make a web app's theme_color opaque to
UpdateWebAppInfoFromManifest() instead of at installation (BMO) or at
read (bookmark apps).
This is important for manifest update checks that needs to compare
the transformed installed web app manifest data with the current page's
manifest data under the same transformations.

Bug: 1103590
Change-Id: Ib243227999ea13c1f00e146b20bb55c39482978d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2288719Reviewed-by: Jeevan Shikaram <jshikaram@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788509}