Linux: move use_system_harfbuzz logic out of the main file.

build/linux/unbundle/README

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+This directory contains files that make it possible to use system libraries.
+
+For more info please read the following:
+
+ - https://fedoraproject.org/wiki/Packaging:No_Bundled_Libraries
+ - https://wiki.gentoo.org/wiki/Why_not_bundle_dependencies
+ - http://www.debian.org/doc/debian-policy/ch-source.html#s-embeddedfiles
+
+For more Chromium-specific context please read
+http://spot.livejournal.com/312320.html .
+
+This directory is provided in the source tree to follow above guidelines.
+It is a compromise solution which takes into account Chromium developers
+who want to avoid the perceived burden of more conditional code in gyp,
+and expectations of Open Source community, where using system-provided
+libraries is the norm.

[darin (slow to review), 2013/04/22 19:11:33]

This is a good description of "why" this code exists, but it probably would be
nice to include a "how" section, so it is clear how one might actually use this
module.  You might consider adding some sample command lines that show how to
use the python script, etc.?

[Paweł Hajdan Jr., 2013/04/22 21:07:18]

Good point. Done. Thanks!