Import Selenium 1.0.3 to fix failure with Firefox on Mac OS X 10.6

The currently used version is 1.0.1.

I downloaded this from:
http://selenium.googlecode.com/files/selenium-remote-control-1.0.3.zip

This has to be committed separately from updating
tools/selenium_tester.py because of the awkward way third_party is
imported using DEPS.

BUG=http://code.google.com/p/nativeclient/issues/detail?id=364
TEST=browser_tests with tools/selenium_tester.py updated

Review URL: http://codereview.chromium.org/4745002

git-svn-id: svn://svn.chromium.org/native_client/trunk/src/third_party@3639 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2