Explicitly specify web font for text-transform test

Explicitly specify web font for text-transform test

We do not want this test to be a test for font fallback and fail
depending on what platform fonts are available, hence explicitly
specifying a web font with wide coverage that we already have in
the repo.

BUG=
TBR=eae,dpranke

Committed: https://crrev.com/e853fd7126fb37bc6045db5e0d1474074909424d
Cr-Commit-Position: refs/heads/master@{#354256}

[drott, 2015-10-15 10:56:28]

The CQ bit was checked by drott@chromium.org

[commit-bot: I haz the power, 2015-10-15 10:56:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1405933002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1405933002/1

[commit-bot: I haz the power, 2015-10-15 13:35:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-15 13:36:12]

Patchset 1 (id:??) landed as
https://crrev.com/e853fd7126fb37bc6045db5e0d1474074909424d
Cr-Commit-Position: refs/heads/master@{#354256}