Fix clang build from 126700.

TBR=ben@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9707002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@126703 0039d316-1c4b-4281-b951-d872f2087c98

ash/system/tray/system_tray_delegate.h

@@ -19,6 +19,7 @@ class SkBitmap;
 namespace ash {
 
 struct NetworkIconInfo {
+  NetworkIconInfo() {}
   SkBitmap image;
   string16 name;
   string16 description;