Remove deprecated code

pkg/analyzer/lib/src/generated/java_core.dart

Index: pkg/analyzer/lib/src/generated/java_core.dart
diff --git a/pkg/analyzer/lib/src/generated/java_core.dart b/pkg/analyzer/lib/src/generated/java_core.dart
index 8c96357213412a82fc357486e641883e33fce2e1..ade555ca678dca81febed6e40c84496e257f509b 100644
--- a/pkg/analyzer/lib/src/generated/java_core.dart
+++ b/pkg/analyzer/lib/src/generated/java_core.dart
@@ -295,14 +295,6 @@ class JavaString {
 }
 
 class JavaSystem {
-  @deprecated
-  static void arraycopy(
-      List src, int srcPos, List dest, int destPos, int length) {
-    for (int i = 0; i < length; i++) {
-      dest[destPos + i] = src[srcPos + i];
-    }
-  }
-
   static int currentTimeMillis() {
     return (new DateTime.now()).millisecondsSinceEpoch;
   }