Revert of Use UtilityProcessHost to patch files. (https://codereview.chromium.org...

Revert of Use UtilityProcessHost to patch files. (https://codereview.chromium.org/25909005/)

Reason for revert:
linux asan failure

http://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%2BLSan%20Tests%20%282%29/builds/901/steps/unit_tests/logs/DifferentialUpdateFails

Original issue's description:
> Use UtilityProcessHost to patch files.
>
> Second part of a 2-part changelist.
> The first part is https://codereview.chromium.org/25883006/
>
> BUG=304879
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=259726

TBR=sorin@chromium.org,dgarrett@chromium.org,sky@chromium.org,cdn@chromium.org,waffles@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=304879

Review URL: https://codereview.chromium.org/213923002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@259740 0039d316-1c4b-4281-b951-d872f2087c98