Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/SVGRect.dartdoc

Index: lib/html/doc/interface/SVGRect.dartdoc
diff --git a/lib/html/doc/interface/SVGRect.dartdoc b/lib/html/doc/interface/SVGRect.dartdoc
deleted file mode 100644
index 28212d16a9ce68d8f2104afe04d19dd6fd94768b..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/SVGRect.dartdoc
+++ /dev/null
@@ -1,23 +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.
-
-// WARNING:
-//   This file contains documentation that is merged into the real source.
-//   Do not make code changes here.
-
-/// @domName SVGRect
-interface SVGRect {
-
-  /** @domName SVGRect.height */
-  num height;
-
-  /** @domName SVGRect.width */
-  num width;
-
-  /** @domName SVGRect.x */
-  num x;
-
-  /** @domName SVGRect.y */
-  num y;
-}