Change int.fromEnvironment in VM to use same code as int.parse.

sdk/lib/_internal/lib/core_patch.dart

Index: sdk/lib/_internal/lib/core_patch.dart
diff --git a/sdk/lib/_internal/lib/core_patch.dart b/sdk/lib/_internal/lib/core_patch.dart
index 9e1c51f706c1467c15479b9bbb13f974ae99c9b2..601149a35bad17564bcae335bb55bea3cbb881d4 100644
--- a/sdk/lib/_internal/lib/core_patch.dart
+++ b/sdk/lib/_internal/lib/core_patch.dart
@@ -105,7 +105,7 @@ patch class int {
 
   patch factory int.fromEnvironment(String name, {int defaultValue}) {
     throw new UnsupportedError(
-        'int.fromEnvironement can only be used as a const constructor');
+        'int.fromEnvironment can only be used as a const constructor');
   }
 }
 
@@ -227,14 +227,14 @@ patch class String {
 
   patch factory String.fromEnvironment(String name, {String defaultValue}) {
     throw new UnsupportedError(
-        'String.fromEnvironement can only be used as a const constructor');
+        'String.fromEnvironment can only be used as a const constructor');
   }
 }
 
 patch class bool {
   patch factory bool.fromEnvironment(String name, {bool defaultValue: false}) {
     throw new UnsupportedError(
-        'bool.fromEnvironement can only be used as a const constructor');
+        'bool.fromEnvironment can only be used as a const constructor');
   }
 }