Remove the dependency on json schema compiler.

tools/json_schema_compiler/test/callbacks.json

Index: tools/json_schema_compiler/test/callbacks.json
diff --git a/tools/json_schema_compiler/test/callbacks.json b/tools/json_schema_compiler/test/callbacks.json
deleted file mode 100644
index 2f86c26e15e07c36ee913b0798d6c59cab33f172..0000000000000000000000000000000000000000
--- a/tools/json_schema_compiler/test/callbacks.json
+++ /dev/null
@@ -1,72 +0,0 @@
-[
-  {
-    "namespace": "callbacks",
-    "description": "The callbacks API.",
-    "types": [],
-    "functions": [
-      {
-        "name": "returnsNothing",
-        "type": "function",
-        "description": "Takes nothing. Returns nothing.",
-        "parameters": [
-          {
-            "name": "callback",
-            "type": "function",
-            "parameters": []
-          }
-        ]
-      },
-      {
-        "name": "returnsObject",
-        "description": "Returns an object.",
-        "type": "function",
-        "parameters": [
-          {
-            "name": "callback",
-            "type": "function",
-            "parameters": [
-              {
-                "name": "someObject",
-                "type": "object",
-                "properties": {
-                  "state": {
-                    "type": "string",
-                    "enum": ["foo", "bar", "baz"]
-                  }
-                }
-              }
-            ]
-          }
-        ]
-      },
-      {
-        "name": "returnsMultiple",
-        "description": "Returns an object.",
-        "type": "function",
-        "parameters": [
-          {
-            "name": "callback",
-            "type": "function",
-            "parameters": [
-              {
-                "name": "someInteger",
-                "type": "integer"
-              },
-              {
-                "name": "someObject",
-                "type": "object",
-                "properties": {
-                  "state": {
-                    "type": "string",
-                    "enum": ["foo", "bar", "baz"]
-                  }
-                }
-              }
-            ]
-          }
-        ]
-      }
-    ]
-  }
-]
-