Remove unused using.

diff --git a/src/lib/audio_content.cc b/src/lib/audio_content.cc
index 8f2bb88a514a6ab718583d24ffa714fb2e24568b..4e9d5cd5cee5395b3a22058fd0cf6c08f57e1e57 100644 (file)
--- a/src/lib/audio_content.cc
+++ b/src/lib/audio_content.cc
@@ -35,7 +35,6 @@
 using std::string;
 using std::cout;
 using std::vector;
-using std::stringstream;
 using std::fixed;
 using std::list;
 using std::pair;