partial support for Safari testing https://codereview.appspot.com/9022043
partial support for Safari testing
https://codereview.appspot.com/9022043

With this CL, browser tests of safari work when connecting to a remote
webdriver.  Meaning:
  1. start "java -jar selenium-standalone*.jar"
  2. run "ant brtest -Dtest.browser=safari -Dtest.webdriver.url=http://127.0.0.1:4444/wd/hub"

the main fix in this CL is that window.open doesn't work in the
Safari webdriver.

There's also code to start a local SafariDriver, but that doesn't work
yet. (There's a weird protocol failure when trying to send a command
to the webdriver Safari extension, and I haven't figured out why yet.)

R=kpreid2



git-svn-id: eb21526166532bd3afc2c1499c0cf105ce815f5a@5384 360991c0-9f3b-0410-ba87-8b362a00edf4

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