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Converts some source sets that were source sets into static libraries. Converts additional targets in the touched files to static libraries where it seemed relevant.

A few redundant dependencies were removed (one shouldn't need to specify both "foo" and "foo:test_support"). A few empty source sets were converted to groups.

BUG=627637
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2151013002
Cr-Commit-Position: refs/heads/master@{#405593}