Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/ClientRect.dartdoc

Index: lib/html/doc/interface/ClientRect.dartdoc
diff --git a/lib/html/doc/interface/ClientRect.dartdoc b/lib/html/doc/interface/ClientRect.dartdoc
deleted file mode 100644
index 54bb328faf6a794bc1d571c5b992792712140e0c..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/ClientRect.dartdoc
+++ /dev/null
@@ -1,29 +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 ClientRect
-interface ClientRect {
-
-  /** @domName ClientRect.bottom */
-  final num bottom;
-
-  /** @domName ClientRect.height */
-  final num height;
-
-  /** @domName ClientRect.left */
-  final num left;
-
-  /** @domName ClientRect.right */
-  final num right;
-
-  /** @domName ClientRect.top */
-  final num top;
-
-  /** @domName ClientRect.width */
-  final num width;
-}