Make patch file import declarations apply to the patched library too.

lib/compiler/implementation/lib/web.dartp

Index: lib/compiler/implementation/lib/web.dartp
diff --git a/lib/compiler/implementation/lib/web.dartp b/lib/compiler/implementation/lib/web.dartp
deleted file mode 100644
index c3ba2ad9622b0b90ada24d19f384dfc46e14eba9..0000000000000000000000000000000000000000
--- a/lib/compiler/implementation/lib/web.dartp
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// Patch file for dart:web
-
-/*patch*/ String htmlEscape(String text) {
-  return text.replaceAll("&", "&")
-             .replaceAll("<", "&lt;")
-             .replaceAll(">", "&gt;")
-             .replaceAll('"', "&quot;")
-             .replaceAll("'", "&apos;");  // Different from original.
-}