[chromium] build a DumpRenderTree.pak even on windows
https://bugs.webkit.org/show_bug.cgi?id=111504

Reviewed by Tony Chang.

The Chromium Aura build uses the default theme to draw
controls, and that theme requires the ui ResourceBundle
to be initialized. On every other platform, we build
a DumpRenderTree.pak that works for this, but on Windows we
still compile the resources directly into DRT. As a first step,
let's build the pak file. I will then need to land a patch
in Chromium to actually load it. Then I can go back and move
the resources over to just use the .pak file and no longer need
the .rc's.

* DumpRenderTree/DumpRenderTree.gyp/DumpRenderTree.gyp:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144863 268f45cc-cd09-0410-ab3c-d52691b4dbfc