JasonLeyba: Addressing several build issues from r16414.
JasonLeyba: Addressing several build issues from r16414.

* Allow js_binary input to be defined solely through deps.
* Do not set third_party=true if a js_binary explicitly specifies
third_party=false in its flag definitions. This is necessary to compile the
SafariDriver with all error checks enabled.

r16429

krosenvold/selenium-git-release-candidate,krosenvold/selenium-git-release-candidate,krosenvold/selenium-git-release-candidate,krosenvold/selenium-git-release-candidate,krosenvold/selenium-git-release-candidate,krosenvold/selenium-git-release-candidate,krosenvold/selenium-git-release-candidate,krosenvold/selenium-git-release-candidate