JSON schema compiler can't handle strings as types

tools/json_schema_compiler/test/fontSettings.json

Index: tools/json_schema_compiler/test/fontSettings.json
diff --git a/chrome/common/extensions/api/experimental.fontSettings.json b/tools/json_schema_compiler/test/fontSettings.json
similarity index 98%
copy from chrome/common/extensions/api/experimental.fontSettings.json
copy to tools/json_schema_compiler/test/fontSettings.json
index 689fb447b46d415003b394cfc7bcd8effe9e3af4..be680832f0469e70a8d0a30186618ca5cce1d7a7 100644
--- a/chrome/common/extensions/api/experimental.fontSettings.json
+++ b/tools/json_schema_compiler/test/fontSettings.json
@@ -4,7 +4,7 @@
 
 [
   {
-    "namespace": "experimental.fontSettings",
+    "namespace": "fontSettings",
     "types": [
       {
         "id": "FontName",
@@ -166,7 +166,8 @@
             "name": "details",
             "type": "object",
             "optional": true,
-            "description": "This parameter is currently unused."
+            "description": "This parameter is currently unused.",
+            "properties": {}
           },
           {
             "type": "function",
@@ -184,7 +185,8 @@
             "name": "details",
             "type": "object",
             "optional": true,
-            "description": "This parameter is currently unused."
+            "description": "This parameter is currently unused.",
+            "properties": {}
           },
           {
             "name": "callback",
@@ -235,7 +237,8 @@
             "name": "details",
             "type": "object",
             "optional": true,
-            "description": "This parameter is currently unused."
+            "description": "This parameter is currently unused.",
+            "properties": {}
           },
           {
             "type": "function",
@@ -253,7 +256,8 @@
             "name": "details",
             "type": "object",
             "optional": true,
-            "description": "This parameter is currently unused."
+            "description": "This parameter is currently unused.",
+            "properties": {}
           },
           {
             "name": "callback",
@@ -304,7 +308,8 @@
             "name": "details",
             "type": "object",
             "optional": true,
-            "description": "This parameter is currently unused."
+            "description": "This parameter is currently unused.",
+            "properties": {}
           },
           {
             "type": "function",
@@ -322,7 +327,8 @@
             "name": "details",
             "type": "object",
             "optional": true,
-            "description": "This parameter is currently unused."
+            "description": "This parameter is currently unused.",
+            "properties": {}
           },
           {
             "name": "callback",
@@ -373,7 +379,8 @@
             "name": "details",
             "type": "object",
             "optional": true,
-            "description": "This parameter is currently unused."
+            "description": "This parameter is currently unused.",
+            "properties": {}
           },
           {
             "type": "function",
@@ -391,7 +398,8 @@
             "name": "details",
             "type": "object",
             "optional": true,
-            "description": "This parameter is currently unused."
+            "description": "This parameter is currently unused.",
+            "properties": {}
           },
           {
             "name": "callback",