Reduce the perf overhead of our dangling markup experiments.

url/third_party/mozilla/url_parse.h

Index: url/third_party/mozilla/url_parse.h
diff --git a/url/third_party/mozilla/url_parse.h b/url/third_party/mozilla/url_parse.h
index 222d6053232e572bfdcfafe7cbc24cfabc5f6f66..968578badbb418d457605142a1704d9cbb0f9406 100644
--- a/url/third_party/mozilla/url_parse.h
+++ b/url/third_party/mozilla/url_parse.h
@@ -177,6 +177,9 @@ struct URL_EXPORT Parsed {
   // the string with the scheme stripped off.
   Component GetContent() const;
 
+  // True if whitespace was removed from the URL during parsing.
+  bool whitespace_removed;
+
   // This is used for nested URL types, currently only filesystem.  If you
   // parse a filesystem URL, the resulting Parsed will have a nested
   // inner_parsed_ to hold the parsed inner URL's component information.