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This is pretty much the same as existing Pepper Socket API.  Since the
original code for socket is in chrome_content_browser_client.h for
crossing chrome-content boundary, it's moved to the new file
pepper_util.cc, so that PepperCrxFileSystemMessageFilter can access
directory inside chrome space.

BUG=240865

Review URL: https://chromiumcodereview.appspot.com/15521002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202951 0039d316-1c4b-4281-b951-d872f2087c98