Remove support for MSVC

sky/engine/core/dom/ElementData.h

Index: sky/engine/core/dom/ElementData.h
diff --git a/sky/engine/core/dom/ElementData.h b/sky/engine/core/dom/ElementData.h
index 101c4336387b11b4ee72d2cf73fd7acdbb4e2d3a..1113e0604c07ea643c3493baec2fba77cb9bbb2e 100644
--- a/sky/engine/core/dom/ElementData.h
+++ b/sky/engine/core/dom/ElementData.h
@@ -104,11 +104,6 @@ private:
     template<typename T> inline thisType* to##thisType(const RefPtr<T>& data) { return to##thisType(data.get()); } \
     DEFINE_TYPE_CASTS(thisType, ElementData, data, pointerPredicate, referencePredicate)
 
-#if COMPILER(MSVC)
-#pragma warning(push)
-#pragma warning(disable: 4200) // Disable "zero-sized array in struct/union" warning
-#endif
-
 // SharableElementData is managed by ElementDataCache and is produced by
 // the parser during page load for elements that have identical attributes. This
 // is a memory optimization since it's very common for many elements to have
@@ -140,10 +135,6 @@ public:
 
 DEFINE_ELEMENT_DATA_TYPE_CASTS(ShareableElementData, !data->isUnique(), !data.isUnique());
 
-#if COMPILER(MSVC)
-#pragma warning(pop)
-#endif
-
 // UniqueElementData is created when an element needs to mutate its attributes
 // or gains presentation attribute style (ex. width="10"). It does not need to
 // be created to fill in values in the ElementData that are derived from