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This change is credited to digit@, who included this cleanup in a
prototype reference CL.  I'm cleaning it up and landing it.

Refactor common shared_library() declarations for libchrome.so,
libchromefortest.so and libmonochrome.so into a shared template.

BUG=

Change-Id: Ie0c2005c04a664de1cf24e3536aa8b02d745f75d
Reviewed-on: https://chromium-review.googlesource.com/c/1318432
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Reviewed-by: David Turner <digit@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606035}