Add possibility to expand strings in the autoroller.
Add possibility to expand strings in the autoroller.

Starting from crrev.com/c/2265498, the Chromium DEPS file has a new
function Str(), which seems to just expand to the string it wraps.

This causes the following error:

  NameError: name 'Str' is not defined

In //tools_webrtc/autoroller/roll_deps.py.

This CL adds a way to expand the string.

No-Try: True
Bug: None
Change-Id: I4cdb43410edeed72b393f200314c0ee7eea9cb2a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/178865
Commit-Queue: Mirko Bonadei <d2c43c210eae6feef04f53bae50885e8152edcca@webrtc.org>
Reviewed-by: Jeremy Leconte <24583aea4726e922fc48ee725ba1b8aadbe9fd66@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#31661}

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