Double the size of the stateful partition for vm testing.
Double the size of the stateful partition for vm testing.

BUG=chromium-os:34126
TEST=image_to_vm with new size and ran desktopui_NaClSanity

Change-Id: I5553de776cb5dec3d2b0dde362ff3560926a6472
Reviewed-on: https://gerrit.chromium.org/gerrit/32424
Reviewed-by: Rahul Chaturvedi <4daac3e8e16f1590440c06bbd944ab7fcb8de43e@chromium.org>
Tested-by: Chris Sosa <959d3d631fb6f17f1b07f751372041a1edb210d1@chromium.org>

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