[Author: thomasvl]

Remove the GC support code.
Add the needed images for the iOS unittests under iOS 6.0.
Add a workspace file for the iPhone project.

R=dmaclach
DELTA=215  (85 added, 122 deleted, 8 changed)

git-svn-id: http://google-toolbox-for-mac.googlecode.com/svn/trunk@594 7dc7ac4e-7543-0410-b95c-c1676fc8e2a3