gn: Fix typo in error message (for label pattern wildcards).

tools/gn/label_pattern.cc

Index: tools/gn/label_pattern.cc
diff --git a/tools/gn/label_pattern.cc b/tools/gn/label_pattern.cc
index 752898f1acace2f03bdddc25315da680728b6d00..396a9b73a9d4fc1f269d926496b2dda5d0a46e89 100644
--- a/tools/gn/label_pattern.cc
+++ b/tools/gn/label_pattern.cc
@@ -161,7 +161,7 @@ LabelPattern LabelPattern::GetPattern(const SourceDir& current_dir,
     // The non-wildcard stuff better not have a wildcard.
     if (path.find('*') != base::StringPiece::npos) {
       *err = Err(value, "Label patterns only support wildcard suffixes.",
-          "The pattern contained a '*' that wasn't at tne end.");
+          "The pattern contained a '*' that wasn't at the end.");
       return LabelPattern();
     }