Rework target process creation to minimize creation routes
Changes the creation strategy for the target process to minimize the
differences between the "normal" process creation and the appcontainer
process creation. The hope is this minimization might remedy the failure
to initialize the process when appcontainer is being used on win8+

BUG=467920

Review URL: https://codereview.chromium.org/1263603002

Cr-Commit-Position: refs/heads/master@{#353752}
6 files changed