<rdar://problem/7883987> ASSERTION FAILED: ASSERT(input == AnimationStateInputEndTime...

<rdar://problem/7883987> ASSERTION FAILED: ASSERT(input == AnimationStateInputEndTimerFired || input == AnimationStateInputPlayStatePaused) in AnimationBase::updateStateMachine causing multiple "crashes" on Lion Intel Debug WebKit testers
https://bugs.webkit.org/show_bug.cgi?id=81351

Rubber-stamped by Jessie Berlin.

* page/animation/AnimationBase.cpp:
(WebCore::AnimationBase::updateStateMachine): Replaced the assertion with a LOG_ERROR so that
the issue is still noticeable, but it does not automatically make the debug bots red.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@111884 268f45cc-cd09-0410-ab3c-d52691b4dbfc