Implement a module system for the extension bindings JS.

chrome/renderer/extensions/json_schema_unittest.cc

Index: chrome/renderer/extensions/json_schema_unittest.cc
diff --git a/chrome/renderer/extensions/json_schema_unittest.cc b/chrome/renderer/extensions/json_schema_unittest.cc
index 1e76b41986046c61acc8cfce2f864bdb4213ec20..c4b06147e107988d79f1be5a83a45ee4cdd7a5e6 100644
--- a/chrome/renderer/extensions/json_schema_unittest.cc
+++ b/chrome/renderer/extensions/json_schema_unittest.cc
@@ -25,15 +25,14 @@ class JsonSchemaTest : public V8UnitTest {
     std::string code = ResourceBundle::GetSharedInstance().GetRawDataResource(
         IDR_JSON_SCHEMA_JS).as_string();
 
-    // This is a nasty hack, but it is easier to test the code if we don't use
-    // it as a v8 extension. So replace the only bit that relies on that with a
-    // more easily testable implementation.
-    ReplaceFirstSubstringAfterOffset(&code, 0,
-        "native function GetChromeHidden();",
-        "function GetChromeHidden() {\n"
-        "  if (!this.chromeHidden) this.chromeHidden = {};\n"
-        "  return this.chromeHidden;\n"
-        "}");
+    // json_schema.js expects to have requireNative() defined.
+    ExecuteScriptInContext(
+        "function requireNative(id) {"
+        "  return {"
+        "    GetChromeHidden: function() { return {}; },"
+        "  };"
+        "}",
+        "test-code");
     ExecuteScriptInContext(code, kJsonSchema);
 
     // Add the test functions to the context.