update-w3c-deps: Do not modify testharness tests.

third_party/WebKit/LayoutTests/imported/csswg-test/css-snap-size-1/snap-width-parsing-001.html

Index: third_party/WebKit/LayoutTests/imported/csswg-test/css-snap-size-1/snap-width-parsing-001.html
diff --git a/third_party/WebKit/LayoutTests/imported/csswg-test/css-snap-size-1/snap-width-parsing-001.html b/third_party/WebKit/LayoutTests/imported/csswg-test/css-snap-size-1/snap-width-parsing-001.html
index 9ed4696386761ea9ce7b9684651a47f1897cea12..f358bedb38457cbcbea28481af227faed183e098 100644
--- a/third_party/WebKit/LayoutTests/imported/csswg-test/css-snap-size-1/snap-width-parsing-001.html
+++ b/third_party/WebKit/LayoutTests/imported/csswg-test/css-snap-size-1/snap-width-parsing-001.html
@@ -16,10 +16,10 @@
 
 <div style="snap-width: 20px; snap-width: initial" data-expected="0px"></div>
 
-<!--  "0" is a valid length even without units  -->
+<!-- "0" is a valid length even without units -->
 <div style="snap-width: 20px; snap-width: 0" data-expected="0px"></div>
 
-<!--  These are invalid and thus its preceding declarations should remain  -->
+<!-- These are invalid and thus its preceding declarations should remain -->
 <div style="snap-width: 20px; snap-width: 1" data-expected="20px"></div>
 <div style="snap-width: 20px; snap-width: -1px" data-expected="20px"></div>
 <div style="snap-width: 20px; snap-width: 10%" data-expected="20px"></div>