Added a check for the utf8 string input being empty (NULL).

chrome/test/data/is_search_provider_installed.html

Index: chrome/test/data/is_search_provider_installed.html
diff --git a/chrome/test/data/is_search_provider_installed.html b/chrome/test/data/is_search_provider_installed.html
index 5e51c1793ede35d0971ea4b12e7d343c80eb02b5..85de2a9c16802fa9e3d06a45d8813d571c0d20f1 100644
--- a/chrome/test/data/is_search_provider_installed.html
+++ b/chrome/test/data/is_search_provider_installed.html
@@ -52,7 +52,7 @@ try {
   var originWithDifferentPort = document.location.protocol + "//" +
       document.location.hostname + differentPort + "/";
 
-  // Verify existance of the api.
+  // Verify existence of the api.
   var foundApi = false;
   try {
     if (window.external.IsSearchProviderInstalled)
@@ -83,7 +83,8 @@ try {
 
   writeResult();
 } catch (e) {
-  logFailed("An exception occurred. Name: " + e.name + " Message: " + e.message);
+  logFailed("An exception occurred. Name: " + e.name + " Message: " +
+            e.message);
   writeResult();
 }
 </script>