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For now, although the --ash-browsertests switch will launch browser_tests in Ash in Metro, most tests are still hardcoded to open browsers on the native desktop (HOST_DESKTOP_TYPE_NATIVE) -- follow-up CLs will be required to have all tests use GetActiveDesktop() instead and then add some checks to make sure no browsers are left on the wrong desktop when tests complete.

I'm not making this the default browser_tests on Windows 8 because regular Desktop browser_tests should still be runnable, testable, debuggable, etc. on Win8 machines.

BUG=179830
TEST="browser_tests.exe --ash-browsertests" should launch Ash in Metro for every test, each test should pass and exit (although most tests will no open browsers in Ash itself for now -- no checks is currently added to make sure of that so they should pass).

Review URL: https://chromiumcodereview.appspot.com/16022003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@207936 0039d316-1c4b-4281-b951-d872f2087c98