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This CL removes the restriction on the maximum number of WebAPK share targets
by switching from a checked-in ShareActivity{{index}} to an activity alias.

Bug=None

Change-Id: I40567760615da5a9e0c218621df6eac749cf80d0
Reviewed-on: https://chromium-review.googlesource.com/1191088
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Xi Han <hanxi@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587808}