Deprecate Math object in corelib in favor of dart:math library.

lib/uri/encode_decode.dart

Index: lib/uri/encode_decode.dart
diff --git a/lib/uri/encode_decode.dart b/lib/uri/encode_decode.dart
index 3ecd8b7a80a302ddb00a6c5f95222ae6c4f3e715..540b7e6fbd6f60cd0ebf8c7de95583eb00110787 100644
--- a/lib/uri/encode_decode.dart
+++ b/lib/uri/encode_decode.dart
@@ -110,8 +110,8 @@ int _hexCharPairToByte(String s, int pos) {
   // An alternative to calling parseInt twice would be to take a
   // two character substring and call it once, but that may be less
   // efficient.
-  int d1 = Math.parseInt("0x${s[pos]}");
-  int d2 = Math.parseInt("0x${s[pos+1]}");
+  int d1 = parseInt("0x${s[pos]}");
+  int d2 = parseInt("0x${s[pos+1]}");
   return d1 * 16 + d2;
 }