Bug 1046078 - Leave testPreferences_masterPassword in 'about:blank' instead of 'about:newtab'. r=hskupin, aeftimie

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branch : mozilla-aurora
extra : transplant_source : %8F%E8g%B6%02tk%F3L%F6J%BC%1A%0E%AC%9F%F4h%EBO
Bug 1046078 - Backout changeset 40192e011707 in order to enable testPreferences_masterPassword.

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branch : mozilla-aurora