Remove deprecated reference to shareButtonAnchorRect

This has been removed from @protocol ActivitySErvicePositioner

Change-Id: I3a5a3676dfc8f2d3451f38bb4b3409e1429c8df4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1616931
Auto-Submit: Peter Lee <pkl@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661289}
2 files changed