Remove SVGSMILElement::animated_property_locked_

We check this member field, but we never set it, so it's of no use
anymore.

Bug: 998526
Change-Id: I6de7399574828fe26f413d0dfcd2a0556540f4c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1831767Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#701462}

third_party/blink/renderer/core/svg/animation/svg_smil_element.h

@@ -118,16 +118,6 @@ class CORE_EXPORT SVGSMILElement : public SVGElement, public SVGTests {
   // animations are rendered useless.
   virtual bool OverwritesUnderlyingAnimationValue() const = 0;
 
-  bool AnimatedTypeIsLocked() const { return animated_property_locked_; }
-  void LockAnimatedType() {
-    DCHECK(!animated_property_locked_);
-    animated_property_locked_ = true;
-  }
-  void UnlockAnimatedType() {
-    DCHECK(animated_property_locked_);
-    animated_property_locked_ = false;
-  }
-
   void ScheduleEvent(const AtomicString& event_type);
   void ScheduleRepeatEvents();
   void DispatchPendingEvent(const AtomicString& event_type);
@@ -287,7 +277,6 @@ class CORE_EXPORT SVGSMILElement : public SVGElement, public SVGTests {
   mutable SMILTime cached_min_;
   mutable SMILTime cached_max_;
 
-  bool animated_property_locked_;
   bool interval_has_changed_;
 
   friend class ConditionEventListener;

third_party/blink/renderer/core/svg/svg_animate_element.cc

@@ -443,12 +443,6 @@ void SVGAnimateElement::ClearAnimatedType() {
   if (!animated_value_)
     return;
 
-  // The animated property lock is held for the "result animation" (see
-  // SMILTimeContainer::updateAnimations()) while we're processing an animation
-  // group. We will very likely crash later if we clear the animated type while
-  // the lock is held. See crbug.com/581546.
-  DCHECK(!AnimatedTypeIsLocked());
-
   SVGElement* target_element = targetElement();
   if (!target_element) {
     animated_value_.Clear();