servo: Merge #20150 - Remove text-is-significant param from Gecko_IsSignificantChild (from upsuper:text-is-significant); r=emilio

This is Servo side change of [bug 1441729](https://bugzilla.mozilla.org/show_bug.cgi?id=1441729).

Source-Repo: https://github.com/servo/servo
Source-Revision: 90b8410b05e8aab35e3885820a37c6239252cca1

--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : a141e4615f1d7aca05918e65536fd0ef41874495

servo/components/style/gecko/generated/bindings.rs

@@ -608,7 +608,6 @@ extern "C" {
 extern "C" {
     pub fn Gecko_IsSignificantChild(
         node: RawGeckoNodeBorrowed,
-        text_is_significant: bool,
         whitespace_is_significant: bool,
     ) -> bool;
 }

servo/components/style/gecko/wrapper.rs

@@ -256,7 +256,7 @@ impl<'ln> GeckoNode<'ln> {
 
     #[inline]
     fn contains_non_whitespace_content(&self) -> bool {
-        unsafe { Gecko_IsSignificantChild(self.0, true, false) }
+        unsafe { Gecko_IsSignificantChild(self.0, false) }
     }
 }
 
@@ -1933,7 +1933,7 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
 
     fn is_empty(&self) -> bool {
         !self.as_node().dom_children().any(|child| unsafe {
-            Gecko_IsSignificantChild(child.0, true, true)
+            Gecko_IsSignificantChild(child.0, true)
         })
     }