-Wunused-functions for linux, android, chromeos

chrome/browser/performance_monitor/performance_monitor.cc

Index: chrome/browser/performance_monitor/performance_monitor.cc
diff --git a/chrome/browser/performance_monitor/performance_monitor.cc b/chrome/browser/performance_monitor/performance_monitor.cc
index 358b78f30d3f59df4b6fa9f0a96199925ee15478..fefe7c7dd13d9a984d6a5c406aee93dff6bcd929 100644
--- a/chrome/browser/performance_monitor/performance_monitor.cc
+++ b/chrome/browser/performance_monitor/performance_monitor.cc
@@ -56,7 +56,7 @@ std::string TimeToString(base::Time time) {
   int64 time_int64 = time.ToInternalValue();
   return base::Int64ToString(time_int64);
 }
-#endif
+#endif  // !defined(OS_ANDROID)
 
 bool StringToTime(std::string time, base::Time* output) {
   int64 time_int64 = 0;