Bug 1067266 - Removed BLUE_CHANGE_DELAY from input management script as a follow-up of bug 1057898.

Additionally, one test case was removed as the specific scenario should now be handled/guarded by Gecko (i.e. bug 1057898).
Merge pull request #24048 from mnjul/bug_1067266_remove_blur_change_inputmgnt

Bug 1067266 - Removed BLUE_CHANGE_DELAY from input management script as a follow-up of bug 1057898. r=timdream