[PPAPI] Moving pp::VarResource_Dev API into pp::Var (now stable).

ppapi/cpp/resource.h

Index: ppapi/cpp/resource.h
diff --git a/ppapi/cpp/resource.h b/ppapi/cpp/resource.h
index 311db6a1caf4b005f5c94b6a23f93466119acb94..96477d8d69c4e721211778938be8c1dda665bcae 100644
--- a/ppapi/cpp/resource.h
+++ b/ppapi/cpp/resource.h
@@ -14,7 +14,7 @@
 /// with the module.
 namespace pp {
 
-class VarResource_Dev;
+class VarResource;
 
 /// A reference counted module resource.
 class Resource {
@@ -87,7 +87,7 @@ class Resource {
   void Clear();
 
  private:
-  friend class VarResource_Dev;
+  friend class VarResource;
 
   PP_Resource pp_resource_;
 };