Update PPAPI IDL generator to define versioned structs, and unversioned typedef.

ppapi/tests/test_var.h

Index: ppapi/tests/test_var.h
diff --git a/ppapi/tests/test_var.h b/ppapi/tests/test_var.h
index a329c780e13a2023665ceac6094b18704b10c39c..eac3f35fbd09bd393a1071c70e8eeabbf9ac7a54 100644
--- a/ppapi/tests/test_var.h
+++ b/ppapi/tests/test_var.h
@@ -7,11 +7,10 @@
 
 #include <string>
 
+#include "ppapi/c/ppb_var.h"
 #include "ppapi/cpp/var.h"
 #include "ppapi/tests/test_case.h"
 
-struct PPB_Var;
-
 class TestVar : public TestCase {
  public:
   explicit TestVar(TestingInstance* instance) : TestCase(instance) {}
@@ -35,4 +34,3 @@ class TestVar : public TestCase {
 };
 
 #endif  // PPAPI_TEST_TEST_VAR_H_
-