Allow tail to not be trimmed.

url/gurl.h

Index: url/gurl.h
diff --git a/url/gurl.h b/url/gurl.h
index 6af7d44a95d8a56f9c4008ce994264413a534d1c..232f9614b269299dfdc887396f81525a2d57f6ae 100644
--- a/url/gurl.h
+++ b/url/gurl.h
@@ -36,6 +36,8 @@ class URL_EXPORT GURL {
   explicit GURL(const std::string& url_string /*, output_param_encoding*/);
   explicit GURL(const base::string16& url_string /*, output_param_encoding*/);
 
+  enum TrimInputControl { NO_TRIM_TAIL, };
+  GURL(const std::string& url_string, TrimInputControl trim);
   // Constructor for URLs that have already been parsed and canonicalized. This
   // is used for conversions from KURL, for example. The caller must supply all
   // information associated with the URL, which must be correct and consistent.