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

third_party/WebKit/LayoutTests/imported/wpt/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-candidate-insert-before.html

Index: third_party/WebKit/LayoutTests/imported/wpt/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-candidate-insert-before.html
diff --git a/third_party/WebKit/LayoutTests/imported/wpt/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-candidate-insert-before.html b/third_party/WebKit/LayoutTests/imported/wpt/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-candidate-insert-before.html
index a576fdffe36fc67859af21e9994ea6ed3701f89e..39c9887505271b157bdf1b27691c9315f729746d 100644
--- a/third_party/WebKit/LayoutTests/imported/wpt/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-candidate-insert-before.html
+++ b/third_party/WebKit/LayoutTests/imported/wpt/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-candidate-insert-before.html
@@ -19,9 +19,9 @@ var t = async_test(function(t) {
   v.appendChild(createSource('#a')); // invokes resource selection
 });
 </script>
-<!--  now resource selection algorithm will continue its sync section (the </script> tag below provides a stable state)  -->
-<!--  #a is candidate  -->
-<!--  pointer is between #a and the end of the list  -->
+<!-- now resource selection algorithm will continue its sync section (the </script> tag below provides a stable state) -->
+<!-- #a is candidate -->
+<!-- pointer is between #a and the end of the list -->
 <script>
 t.step(function() {
   v.insertBefore(createSource('#b'), v.firstChild); // pointer is unchanged, #a is still candidate