Remove redundant check for CSS_DEG type, isAngle() is more general

Source/core/animation/DoubleStyleInterpolation.cpp

Index: Source/core/animation/DoubleStyleInterpolation.cpp
diff --git a/Source/core/animation/DoubleStyleInterpolation.cpp b/Source/core/animation/DoubleStyleInterpolation.cpp
index ad1989e06916a0225d1e66a0b3aa83a554848849..b4eb68d700d47ec30f4ade3f7a31072d3b7a9998 100644
--- a/Source/core/animation/DoubleStyleInterpolation.cpp
+++ b/Source/core/animation/DoubleStyleInterpolation.cpp
@@ -102,7 +102,7 @@ bool extractMotionRotation(const CSSValue& value, float* rotation, MotionRotatio
         } else if (primitiveValue->getValueID() == CSSValueReverse) {
             *rotationType = MotionRotationAuto;
             *rotation += 180;
-        } else if (primitiveValue->isAngle() || primitiveValue->primitiveType() == CSSPrimitiveValue::CSS_DEG) {
+        } else if (primitiveValue->isAngle()) {
             *rotation += primitiveValue->computeDegrees();
         } else {
             return false;