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This CL moves kSaveCard and kLocalCardMigration PageActionIcons into the
OmniboxPageActionIconContainerView so they can be reused by PWA windows.

This removes them from the LocationBarView and makes them conform to the
interface used by the majority of the PageActionIcons.

Before: https://bugs.chromium.org/p/chromium/issues/attachment?aid=411699&signed_aid=oN3fSiCBdesl2B-kWaptBQ==&inline=1
After: https://bugs.chromium.org/p/chromium/issues/attachment?aid=411700&signed_aid=PouzN_Ing1hmoMWdLqXZVA==&inline=1

Bug: 788051
Change-Id: Iebc963bdf24eeb5e16257065f79caefdc9158dba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803018
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696707}