NaCl SDK: Remove more unused variables in examples

native_client_sdk/src/examples/api/var_dictionary/var_dictionary.cc

Index: native_client_sdk/src/examples/api/var_dictionary/var_dictionary.cc
diff --git a/native_client_sdk/src/examples/api/var_dictionary/var_dictionary.cc b/native_client_sdk/src/examples/api/var_dictionary/var_dictionary.cc
index 9291036d41e6dfa1fea9b3441c76ad942e44efec..052c9103c6710e707ed565ebc72cdaf104377965 100644
--- a/native_client_sdk/src/examples/api/var_dictionary/var_dictionary.cc
+++ b/native_client_sdk/src/examples/api/var_dictionary/var_dictionary.cc
@@ -25,8 +25,6 @@ static const char kDeleteCommand[] = "Delete";
 static const char kHasKeyCommand[] = "HasKey";
 static const char kGetKeysCommand[] = "GetKeys";
 
-static const char kCommandKey[] = "cmd";
-
 pp::Var MakeResult(const char* cmd, const pp::Var& value,
                    const pp::Var& newDictionary) {
   pp::VarDictionary dict;