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process_file_template would fail when the template argument was a string instead of a list, but the previous behavior (and the documentation) describes it as being able to take a string or a list as an argument.

It would also fail if the result was not an absolute file. This is required for most uses of sources expansions, but not for process_file_template which just returns the strings of whatever the results were. This adds "AsStrings" version of the sources expansions writer.

R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/462103004

Cr-Commit-Position: refs/heads/master@{#289112}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289112 0039d316-1c4b-4281-b951-d872f2087c98