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This patch adds a function to modify file system sandbox rules to replace the
\??\ NT prefix with the correct escaped form \/?/?\ for the wildcard matching
rules in the broker. This is done generally as it's a common mistake in the
sandbox code and so provides some defence in depth.

BUG=334882

Review URL: https://codereview.chromium.org/432543005

Cr-Commit-Position: refs/heads/master@{#290131}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290131 0039d316-1c4b-4281-b951-d872f2087c98