CPP: Fix compilation error on Clang.

cpp/test/phonenumbers/unicodestring_test.cc

@@ -22,17 +22,17 @@
 
 using std::ostream;
 
+namespace i18n {
+namespace phonenumbers {
+
 // Used by GTest to print the expected and actual results in case of failure.
-ostream& operator<<(ostream& out, const i18n::phonenumbers::UnicodeString& s) {
+ostream& operator<<(ostream& out, const UnicodeString& s) {
   string utf8;
   s.toUTF8String(utf8);
   out << utf8;
   return out;
 }
 
-namespace i18n {
-namespace phonenumbers {
-
 TEST(UnicodeString, ToUTF8StringWithEmptyString) {
   UnicodeString s;
   string utf8;