Revert "Add fast-mode Uri class."

sdk/lib/_internal/js_runtime/lib/core_patch.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.
 
 // Patch file for dart:core classes.
 import "dart:_internal" as _symbol_dev;
 import 'dart:_interceptors';
 import 'dart:_js_helper' show checkInt,
                               Closure,
                               ConstantMap,
@@ skipping 569 matching lines @@
           "Receiver: ${receiverText}\n"
           "Tried calling: $memberName($actualParameters)\n"
           "Found: $memberName($formalParameters)";
     }
   }
 }
 
 @patch
 class Uri {
   @patch
+  static bool get _isWindows => false;
+
+  @patch
   static Uri get base {
     String uri = Primitives.currentUri();
     if (uri != null) return Uri.parse(uri);
     throw new UnsupportedError("'Uri.base' is not supported");
   }
-}
 
-@patch
-class _Uri {
-  @patch
-  static bool get _isWindows => false;
 
   // Matches a String that _uriEncodes to itself regardless of the kind of
   // component.  This corresponds to [_unreservedTable], i.e. characters that
   // are not encoded by any encoding table.
   static final RegExp _needsNoEncoding = new RegExp(r'^[\-\.0-9A-Z_a-z~]*$');
 
   /**
    * This is the internal implementation of JavaScript's encodeURI function.
    * It encodes all characters in the string [text] except for those
    * that appear in [canonicalTable], and returns the escaped string.
@@ skipping 141 matching lines @@
       return getTraceFromException(error);
     }
     // Fallback if Error.captureStackTrace does not exist.
     try {
       throw '';
     } catch (_, stackTrace) {
       return stackTrace;
     }
   }
 }