Revert "Use TypeNamespace instances in aidl.cpp"

This fixes a build break while we investigate.

This reverts commit d03b54f61d1a0fb1a2791ee96d476180a5d38c85.

Change-Id: I200e7a6c84274e71ea661f8d952807e8266c5e54
diff --git a/generate_java.h b/generate_java.h
index b67a88c..12d9f57 100644
--- a/generate_java.h
+++ b/generate_java.h
@@ -12,13 +12,11 @@
 using std::string;
 using std::vector;
 
-class JavaTypeNamespace;
-
 int generate_java(const string& filename, const string& originalSrc,
-                  interface_type* iface, JavaTypeNamespace* types);
+                interface_type* iface);
 
 android::aidl::Class* generate_binder_interface_class(
-    const interface_type* iface, JavaTypeNamespace* types);
+    const interface_type* iface);
 
 string gather_comments(extra_text_type* extra);
 string append(const char* a, const char* b);