Change the layout have in sync_setup_flow.cc to only be active on MacOS.
Change the layout have in sync_setup_flow.cc to only be active on MacOS.

BUG=none
TEST=Enable bookmarks on Linux.  The dialog should no longer be too large.

Review URL: http://codereview.chromium.org/402070

git-svn-id: http://src.chromium.org/svn/trunk/src@32431 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 7db7c89dadbb85a379db92c353c79613bf403f3e
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser