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This CL adds FLAG_SHARE_DELETE to many file operations in Chrome's
installer; including in delta patch processing and archive extraction
utilities. This allows processing on files that are held open to be
deleted by another entity so that we can eventually hold temporary files
open with FILE_FLAG_DELETE_ON_CLOSE.

BUG=516207

Change-Id: I1cd03f6360dfcd61fcd2f09797f0923331076415
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2302109Reviewed-by: Will Harris <wfh@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789702}