replace COMPILE_ASSERT with static_assert in platform/

Source/platform/CrossThreadCopier.h

Index: Source/platform/CrossThreadCopier.h
diff --git a/Source/platform/CrossThreadCopier.h b/Source/platform/CrossThreadCopier.h
index a1f593e34c48edfa5132b28b7c595b0961e68641..1e89fe34cff03d290591e52aaf6f4b72eda02cb8 100644
--- a/Source/platform/CrossThreadCopier.h
+++ b/Source/platform/CrossThreadCopier.h
@@ -82,10 +82,10 @@ namespace blink {
         typedef typename WTF::RemovePointer<TypeWithoutPassRefPtr>::Type RefCountedType;
 
         // Verify that only one of the above did a change.
-        COMPILE_ASSERT((WTF::IsSameType<RefPtr<RefCountedType>, T>::value
+        static_assert((WTF::IsSameType<RefPtr<RefCountedType>, T>::value
                         || WTF::IsSameType<PassRefPtr<RefCountedType>, T>::value
                         || WTF::IsSameType<RefCountedType*, T>::value),
-                       OnlyAllowOneTypeModification);
+                        "only one type modification should be allowed");
 
         typedef PassRefPtr<RefCountedType> Type;
         static Type copy(const T& refPtr)