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The default was "iPhone", but that's not supported in Xcode 6, so use
"iPhone 5" in that case.

Also remove an unnecessary call to |connect| when printing supported
devices on Xcode 6. This call is not needed and just hangs for a few
seconds so remove it (all that's really needed is to load the
CoreSimulation framework.

BUG=390581
TEST=With Xcode 6 installed, build iossim then run iossim with no
optional paramters (e.g. out/Debug-iphonesimulator/iossim path/to/my.app
TBR=rohitrao@chromium.org

Review URL: https://codereview.chromium.org/379863002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282075 0039d316-1c4b-4281-b951-d872f2087c98