Cleanup statics in JS classes

This CL removes the static object IDs from each of the CJS_Object
subclasses and moves them to anonymous namespaces. The Spec arrays are
moved to private members of the object classes.

Change-Id: I5dcdb87ef57e4b374b5431580fb55cb75023f8fb
Reviewed-on: https://pdfium-review.googlesource.com/16950
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>
diff --git a/fpdfsdk/javascript/cjs_font.h b/fpdfsdk/javascript/cjs_font.h
index 569e4f1..73bca9e 100644
--- a/fpdfsdk/javascript/cjs_font.h
+++ b/fpdfsdk/javascript/cjs_font.h
@@ -11,13 +11,14 @@
 
 class CJS_Font : public CJS_Object {
  public:
+  static void DefineJSObjects(CFXJS_Engine* pEngine, FXJSOBJTYPE eObjType);
+
   explicit CJS_Font(v8::Local<v8::Object> pObject) : CJS_Object(pObject) {}
   ~CJS_Font() override {}
 
-  static int g_nObjDefnID;
+ private:
+  static int ObjDefnID;
   static JSConstSpec ConstSpecs[];
-
-  static void DefineJSObjects(CFXJS_Engine* pEngine, FXJSOBJTYPE eObjType);
 };
 
 #endif  // FPDFSDK_JAVASCRIPT_CJS_FONT_H_