Clean up stale FIXMEs and TODOs in core/animation

third_party/WebKit/Source/core/animation/PrimitiveInterpolation.h

Index: third_party/WebKit/Source/core/animation/PrimitiveInterpolation.h
diff --git a/third_party/WebKit/Source/core/animation/PrimitiveInterpolation.h b/third_party/WebKit/Source/core/animation/PrimitiveInterpolation.h
index e4f4efb95a1396a396e90fc3f8a63bab4a19e036..b570f7012dfe165d1dd5b0b7bdebd6c1c9a9cb08 100644
--- a/third_party/WebKit/Source/core/animation/PrimitiveInterpolation.h
+++ b/third_party/WebKit/Source/core/animation/PrimitiveInterpolation.h
@@ -96,7 +96,6 @@ private:
 
     void interpolateValue(double fraction, std::unique_ptr<TypedInterpolationValue>& result) const final
     {
-        // TODO(alancutter): Remove this optimisation once Oilpan is default.

[alancutter (OOO until 2018), 2016/09/27 01:14:14]

InterpolationValues are no longer garbage collected, optimisation remains
useful.

         if (!std::isnan(m_lastFraction) && (fraction < 0.5) == (m_lastFraction < 0.5))
             return;
         const TypedInterpolationValue* side = ((fraction < 0.5) ? m_start : m_end).get();