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For a long time (crrev.com/133053) OS==android implies:
gtest_target_type=shared_library
Cleanup the spurious conditions and obsolete TODOs.

BUG=

Review URL: https://codereview.chromium.org/278443003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271222 0039d316-1c4b-4281-b951-d872f2087c98