Delete some unused code found by -Wunused-function

base/bind_unittest.cc

Index: base/bind_unittest.cc
diff --git a/base/bind_unittest.cc b/base/bind_unittest.cc
index 9a6e23f72bb159f1d9d60be4899713079eeecd49..0f91b2ee32e33ec37a43fed23b5124c35825ea76 100644
--- a/base/bind_unittest.cc
+++ b/base/bind_unittest.cc
@@ -179,10 +179,6 @@ int Sum(int a, int b, int c, int d, int e, int f) {
   return a + b + c + d + e + f;
 }
 
-void OutputSum(int* output, int a, int b, int c, int d, int e) {
-  *output = a + b + c + d + e;
-}
-
 const char* CStringIdentity(const char* s) {
   return s;
 }