Remove meta viewport and @viewport CSS rules.

sky/engine/core/core.gni

Index: sky/engine/core/core.gni
diff --git a/sky/engine/core/core.gni b/sky/engine/core/core.gni
index de356fb042b95a5025b4431d5687efcd5de40ae8..b3ebfde620f9737436b54f12c63234cb58cac5a2 100644
--- a/sky/engine/core/core.gni
+++ b/sky/engine/core/core.gni
@@ -215,8 +215,6 @@ sky_core_files = [
   "css/CSSValueList.cpp",
   "css/CSSValuePool.cpp",
   "css/CSSValuePool.h",
-  "css/CSSViewportRule.cpp",
-  "css/CSSViewportRule.h",
   "css/DOMWindowCSS.cpp",
   "css/DOMWindowCSS.h",
   "css/DocumentFontFaceSet.cpp",
@@ -346,8 +344,6 @@ sky_core_files = [
   "css/resolver/StyleResourceLoader.h",
   "css/resolver/TransformBuilder.cpp",
   "css/resolver/TransformBuilder.h",
-  "css/resolver/ViewportStyleResolver.cpp",
-  "css/resolver/ViewportStyleResolver.h",
   "dom/ActiveDOMObject.cpp",
   "dom/Attr.cpp",
   "dom/AttributeCollection.h",
@@ -476,8 +472,6 @@ sky_core_files = [
   "dom/TreeShared.h",
   "dom/UserActionElementSet.cpp",
   "dom/UserActionElementSet.h",
-  "dom/ViewportDescription.cpp",
-  "dom/ViewportDescription.h",
   "dom/WeakNodeMap.cpp",
   "dom/WeakNodeMap.h",
   "dom/custom/CustomElement.cpp",
@@ -1222,7 +1216,6 @@ core_idl_files = get_path_info([
   "css/CSSUnknownRule.idl",
   "css/CSSValue.idl",
   "css/CSSValueList.idl",
-  "css/CSSViewportRule.idl",
   "css/FontFace.idl",
   "css/FontFaceSet.idl",
   "css/FontFaceSetForEachCallback.idl",