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

lib/compiler/implementation/library_map.dart

 // 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.
 
 // TODO(ahe): Long term, it would probably be better if we do not use
 // executable code to define the locations of libraries.
 
 #library('library_map');
 /**
  * Simple struct holding the path to a library and an optional path
@@ skipping 23 matching lines @@
   "dom_deprecated": const LibraryPatchPath(
       "lib/dom/frog/dom_frog.dart", null),
   "html": const LibraryPatchPath(
       "lib/html/frog/html_frog.dart", null),
   "io": const LibraryPatchPath(
       "lib/compiler/implementation/lib/io.dart", null),
   "isolate": const LibraryPatchPath(
       "lib/isolate/isolate_leg.dart", null),
   "json": const LibraryPatchPath(
       "lib/json/json.dart", null),
+  "math": const LibraryPatchPath(
+      "lib/math/math.dart",
+      "lib/compiler/implementation/lib/math.dartp"),
   "uri": const LibraryPatchPath(
       "lib/uri/uri.dart", null),
   "utf": const LibraryPatchPath(
       "lib/utf/utf.dart", null),
   "web": const LibraryPatchPath(
-      "lib/compiler/implementation/lib/web.dart",
-      "lib/compiler/implementation/lib/web.dartp"),
+      "lib/web/web.dart", null),
 };