Remove unused constant

Change-Id: Ife62ee96608a76f70d7118d6cd2de92d45988708
Reviewed-on: https://weave-review.googlesource.com/1443
Reviewed-by: Vitaly Buka <vitalybuka@google.com>
Reviewed-by: Alex Vakulenko <avakulenko@google.com>

src/commands/command_manager_unittest.cc

diff --git a/src/commands/command_manager_unittest.cc b/src/commands/command_manager_unittest.cc
index bbdd7ac..0c890a9 100644
--- a/src/commands/command_manager_unittest.cc
+++ b/src/commands/command_manager_unittest.cc
@@ -21,19 +21,6 @@
 
 namespace {
 
-const char kTestBaseCommands[] = R"({
-  "base": {
-    "reboot": {
-      "parameters": {"delay": "integer"},
-      "results": {}
-    },
-    "shutdown": {
-      "parameters": {},
-      "results": {}
-    }
-  }
-})";
-
 const char kTestVendorCommands[] = R"({
   "robot": {
     "_jump": {