replace COMPILE_ASSERT with static assert in core/css/

Source/core/css/resolver/AnimatedStyleBuilder.cpp

Index: Source/core/css/resolver/AnimatedStyleBuilder.cpp
diff --git a/Source/core/css/resolver/AnimatedStyleBuilder.cpp b/Source/core/css/resolver/AnimatedStyleBuilder.cpp
index 2070ee42878fe4a7cb0ff00fb83db9de00edf213..09c515e572f43798ccda716bcf1ad91d2f099890 100644
--- a/Source/core/css/resolver/AnimatedStyleBuilder.cpp
+++ b/Source/core/css/resolver/AnimatedStyleBuilder.cpp
@@ -86,7 +86,7 @@ BorderImageLength animatableValueToBorderImageLength(const AnimatableValue* valu
 
 template<typename T> T animatableValueRoundClampTo(const AnimatableValue* value, T min = defaultMinimumForClamp<T>(), T max = defaultMaximumForClamp<T>())
 {
-    COMPILE_ASSERT(WTF::IsInteger<T>::value, ShouldUseIntegralTypeTWhenRoundingValues);
+    static_assert(WTF::IsInteger<T>::value, "should use integral type T when rounding values");
     return clampTo<T>(round(toAnimatableDouble(value)->toDouble()), min, max);
 }