Revert "dart:io | Change File.fullPath to FileSystemEntity.resolveSymbolicLinks."

sdk/lib/_internal/lib/io_patch.dart

Index: sdk/lib/_internal/lib/io_patch.dart
diff --git a/sdk/lib/_internal/lib/io_patch.dart b/sdk/lib/_internal/lib/io_patch.dart
index b87d04586b9c8804f4924711ad70cfad676d41a9..1837aaf7dab89e1076eb9e206ed651ddbe0cdfb0 100644
--- a/sdk/lib/_internal/lib/io_patch.dart
+++ b/sdk/lib/_internal/lib/io_patch.dart
@@ -59,9 +59,6 @@ patch class FileSystemEntity {
   patch static _identical(String path1, String path2) {
     throw new UnsupportedError("FileSystemEntity._identical");
   }
-  patch static _resolveSymbolicLinks(String path) {
-    throw new UnsupportedError("FileSystemEntity._resolveSymbolicLinks");
-  }
 }
 
 patch class _File {
@@ -101,6 +98,9 @@ patch class _File {
   patch static int _openStdio(int fd) {
     throw new UnsupportedError("File._openStdio");
   }
+  patch static _fullPath(String path) {
+    throw new UnsupportedError("File._fullPath");
+  }
 }
 
 patch class _RandomAccessFile {