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

lib/compiler/implementation/lib/math.dartp

Index: lib/compiler/implementation/lib/math.dartp
diff --git a/lib/compiler/implementation/lib/math.dartp b/lib/compiler/implementation/lib/math.dartp
deleted file mode 100644
index 2901563f4f5857f7beaff73530f1d104dbcbec79..0000000000000000000000000000000000000000
--- a/lib/compiler/implementation/lib/math.dartp
+++ /dev/null
@@ -1,12 +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:math library.
-
-// Imports the MathNatives class used by the library.
-#import("js_helper.dart");
-
-// Override the sqrt function, as proof-of-concept.
-double sqrt(num value)
-  => JS('double', @'Math.sqrt(#)', checkNum(value));