Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/WebKitCSSFilterValue.dartdoc

Index: lib/html/doc/interface/WebKitCSSFilterValue.dartdoc
diff --git a/lib/html/doc/interface/WebKitCSSFilterValue.dartdoc b/lib/html/doc/interface/WebKitCSSFilterValue.dartdoc
deleted file mode 100644
index 6ed9acb29320a65022b8371c1d4113957b5be5c3..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/WebKitCSSFilterValue.dartdoc
+++ /dev/null
@@ -1,38 +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 WebKitCSSFilterValue
-interface WebKitCSSFilterValue extends CSSValueList {
-
-  static final int CSS_FILTER_BLUR = 10;
-
-  static final int CSS_FILTER_BRIGHTNESS = 8;
-
-  static final int CSS_FILTER_CONTRAST = 9;
-
-  static final int CSS_FILTER_CUSTOM = 12;
-
-  static final int CSS_FILTER_DROP_SHADOW = 11;
-
-  static final int CSS_FILTER_GRAYSCALE = 2;
-
-  static final int CSS_FILTER_HUE_ROTATE = 5;
-
-  static final int CSS_FILTER_INVERT = 6;
-
-  static final int CSS_FILTER_OPACITY = 7;
-
-  static final int CSS_FILTER_REFERENCE = 1;
-
-  static final int CSS_FILTER_SATURATE = 4;
-
-  static final int CSS_FILTER_SEPIA = 3;
-
-  /** @domName WebKitCSSFilterValue.operationType */
-  final int operationType;
-}