Revert "Reland "Merge more Kernel infrastructure from kernel_sdk SDK fork.""

sdk/lib/html/dartium/nativewrappers.dart

Index: sdk/lib/html/dartium/nativewrappers.dart
diff --git a/sdk/lib/html/dartium/nativewrappers.dart b/sdk/lib/html/dartium/nativewrappers.dart
index 441749c6b66ebc76d5ac7de7a4650d0a653c4e1d..55e57421f6172599d63c566546086a580bf4e611 100644
--- a/sdk/lib/html/dartium/nativewrappers.dart
+++ b/sdk/lib/html/dartium/nativewrappers.dart
@@ -4,31 +4,9 @@
 
 library nativewrappers;
 
-class NativeFieldWrapperClass1 {
-  NativeFieldWrapperClass1() {
-    throw new UnsupportedError(
-        "Generative constructors not supported on native types.");
-  }
-}
-
 class NativeFieldWrapperClass2 {
   NativeFieldWrapperClass2() {
     throw new UnsupportedError(
         "Generative constructors not supported on native types.");
   }
 }
-
-class NativeFieldWrapperClass3 {
-  NativeFieldWrapperClass3() {
-    throw new UnsupportedError(
-        "Generative constructors not supported on native types.");
-  }
-}
-
-class NativeFieldWrapperClass4 {
-  NativeFieldWrapperClass4() {
-    throw new UnsupportedError(
-        "Generative constructors not supported on native types.");
-  }
-}
-