Fix wpt/css/css-masking/mask-svg-content/mask-text-001.svg

The test has fixed dimensions of 100x100 pixels - the reference does
not. Add same fixed dimensions to the reference to get the same clipping
behavior.

Bug: 890755
Change-Id: Ib3d12ad1f7ace05027b81b9c683158490ae116ab
Reviewed-on: https://chromium-review.googlesource.com/1256568
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#595936}
diff --git a/css/css-masking/mask-svg-content/reference/mask-text-001-ref.svg b/css/css-masking/mask-svg-content/reference/mask-text-001-ref.svg
index 48737c0..3fabeb0 100644
--- a/css/css-masking/mask-svg-content/reference/mask-text-001-ref.svg
+++ b/css/css-masking/mask-svg-content/reference/mask-text-001-ref.svg
@@ -1,8 +1,9 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:html="http://www.w3.org/1999/xhtml">
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:html="http://www.w3.org/1999/xhtml"
+     width="100px" height="100px">
 <g id="testmeta">
 	<title>CSS Masking: Reftest reference</title>
 	<html:link rel="author" title="Dirk Schulze" href="mailto:dschulze@adobe.com"/>
 	<metadata class="flags">svg</metadata>
 </g>
 <text fill="#000" font-family="Ahem" font-size="12px" transform="rotate(90 50 50)" x="50" y="50">foobar</text>
-</svg>
\ No newline at end of file
+</svg>