[Extensions Bindings] Pull out test resources

extensions/renderer/module_system_test.h

Index: extensions/renderer/module_system_test.h
diff --git a/extensions/renderer/module_system_test.h b/extensions/renderer/module_system_test.h
index 495048e472fc744bcdf8bca652ced042d08e336d..1cfbb7c46fc116eb82db1d8e4f444edd315d6858 100644
--- a/extensions/renderer/module_system_test.h
+++ b/extensions/renderer/module_system_test.h
@@ -13,11 +13,11 @@
 #include "v8/include/v8.h"
 
 namespace extensions {
+class StringSourceMap;
 
 class ModuleSystemTestEnvironment {
  public:
   class AssertNatives;
-  class StringSourceMap;
 
   explicit ModuleSystemTestEnvironment(v8::Isolate* isolate);
   ~ModuleSystemTestEnvironment();