content::RecordAction and content::RecordComputedAction no longer
add any value (they used to do thread hopping) so replace them with
direct calls to base::RecordAction and base::RecordComputedAction.

Also remove includes and using declarations from files not using the
functions at all.

BUG=601483
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2771233002
Cr-Commit-Position: refs/heads/master@{#460037}