Merge the dart:uri library into dart:core and update the Uri class

sdk/lib/core/corelib_sources.gypi

Index: sdk/lib/core/corelib_sources.gypi
diff --git a/sdk/lib/core/corelib_sources.gypi b/sdk/lib/core/corelib_sources.gypi
index 9d6126faffb816edb012684a50ae013fc004bea0..020be2a0ef143abf33225b189b2566c8213a2267 100644
--- a/sdk/lib/core/corelib_sources.gypi
+++ b/sdk/lib/core/corelib_sources.gypi
@@ -11,10 +11,12 @@
     'date_time.dart',
     'double.dart',
     'duration.dart',
+    'encode_decode.dart',  # Only used by uri.dart.

[floitsch, 2013/05/24 20:37:27]

I would move these 3 functions into the uri.dart file.

[Søren Gjesse, 2013/05/27 10:47:21]

I wanted to postpone this to a separate CL to have a smaller diff. It's grown
pretty big already so I will do it here.

     'errors.dart',
     'exceptions.dart',
     'expando.dart',
     'function.dart',
+    'helpers.dart',  # Only used by uri.dart.

[floitsch, 2013/05/24 20:37:27]

ditto.

[Søren Gjesse, 2013/05/27 10:47:21]

Done.

     'identical.dart',
     'int.dart',
     'invocation.dart',
@@ -35,5 +37,6 @@
     'string_sink.dart',
     'symbol.dart',
     'type.dart',
+    'uri.dart',
   ],
 }