Remove explicit interface versions of dartdoc files.

lib/html/doc/interface/SVGGradientElement.dartdoc

Index: lib/html/doc/interface/SVGGradientElement.dartdoc
diff --git a/lib/html/doc/interface/SVGGradientElement.dartdoc b/lib/html/doc/interface/SVGGradientElement.dartdoc
deleted file mode 100644
index 2eaf657ea3f9c0b334ddb64e6f7593fd9ea1658f..0000000000000000000000000000000000000000
--- a/lib/html/doc/interface/SVGGradientElement.dartdoc
+++ /dev/null
@@ -1,28 +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 SVGGradientElement
-interface SVGGradientElement extends SVGElement, SVGURIReference, SVGExternalResourcesRequired, SVGStylable {
-
-  static final int SVG_SPREADMETHOD_PAD = 1;
-
-  static final int SVG_SPREADMETHOD_REFLECT = 2;
-
-  static final int SVG_SPREADMETHOD_REPEAT = 3;
-
-  static final int SVG_SPREADMETHOD_UNKNOWN = 0;
-
-  /** @domName SVGGradientElement.gradientTransform */
-  final SVGAnimatedTransformList gradientTransform;
-
-  /** @domName SVGGradientElement.gradientUnits */
-  final SVGAnimatedEnumeration gradientUnits;
-
-  /** @domName SVGGradientElement.spreadMethod */
-  final SVGAnimatedEnumeration spreadMethod;
-}