DirectWrite: Removed font file name limit when loading from registry.

DirectWrite: Removed font file name limit when loading from registry.
As per original implementation, our intention was to have fixed width for file in cache file.
For loading from registry we can load file name of any length.

BUG=472938
R=cpu

Committed: https://crrev.com/47dbe8c256f635034158e9bb1a6882f4e76faebf
Cr-Commit-Position: refs/heads/master@{#324073}

[cpu_(ooo_6.6-7.5), 2015-04-07 17:30:22]

lgtm

[cpu_(ooo_6.6-7.5), 2015-04-07 17:30:26]

The CQ bit was checked by cpu@chromium.org

[commit-bot: I haz the power, 2015-04-07 17:31:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1063893002/1

[commit-bot: I haz the power, 2015-04-07 18:17:51]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-07 18:18:36]

Patchset 1 (id:??) landed as
https://crrev.com/47dbe8c256f635034158e9bb1a6882f4e76faebf
Cr-Commit-Position: refs/heads/master@{#324073}