Removed 'String::append' from some of the blink source.

Source/core/loader/FormSubmission.cpp

Index: Source/core/loader/FormSubmission.cpp
diff --git a/Source/core/loader/FormSubmission.cpp b/Source/core/loader/FormSubmission.cpp
index 178a996bc763acb3abfd5f022db45241dbde6af4..2ce0991701a4024f09b3c1426fbb9179230821b7 100644
--- a/Source/core/loader/FormSubmission.cpp
+++ b/Source/core/loader/FormSubmission.cpp
@@ -75,8 +75,8 @@ static void appendMailtoPostFormDataToURL(KURL& url, const FormData& data, const
 
     String query = url.query();
     if (!query.isEmpty())
-        query.append('&');
-    query.append(body);
+        query = query + '&';
+    query = query + body;

[abarth-chromium, 2014/01/15 17:50:18]

Can we use StringBuilder here instead?

[Sunil Ratnu, 2014/01/16 05:49:56]

Thanks abarth!

Yes we can use StringBuilder here like this:

StringBuilder query;
query.append(url.query());
if (!query.isEmpty())
    query.append('&');
query.append(body);
url.setQuery(query.toString());

If that is fine with you, I will change it this way.

     url.setQuery(query);
 }