Move iossim to DVTiPhoneSimulatorRemoteClient.

Future versions of Xcode might not work with iPhoneSimulatorRemoteClient.framework. Moving to
DVTiPhoneSimulatorRemoteClient.framework seems to be better supported.

DVTiPhoneSimulatorRemoteClient's API for launching the simulator is mostly
the same, and allows for setting the deviceName string directly instead of
via a preference.

BUG=328874
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/113403002

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@247245 4ff67af0-8c30-449e-8e8b-ad334ec8d88c