Proxy PPB_ArrayBuffer_Dev, make them work over Messaging

ppapi/native_client/src/shared/ppapi_proxy/proxy_var_cache.h

Index: ppapi/native_client/src/shared/ppapi_proxy/proxy_var_cache.h
diff --git a/ppapi/native_client/src/shared/ppapi_proxy/proxy_var_cache.h b/ppapi/native_client/src/shared/ppapi_proxy/proxy_var_cache.h
index 6cec6d457a8ed0bbce819749cc066f6487155438..4e92ff287b44031e4e12e26b9613e5806930d0f8 100644
--- a/ppapi/native_client/src/shared/ppapi_proxy/proxy_var_cache.h
+++ b/ppapi/native_client/src/shared/ppapi_proxy/proxy_var_cache.h
@@ -54,12 +54,8 @@ class ProxyVarCache {
 
  private:
   // Return whether or not a var type is cached.
-  // Note to implementers: be sure to add to this function when adding new
-  // cached types.
-  // TODO(dspringer): When all the complex var types are handled, this
-  // test can turn into something like var.type >= PP_VARTYPE_STRING.
   bool IsCachedType(const PP_Var& var) {
-    return var.type == PP_VARTYPE_STRING || var.type == PP_VARTYPE_OBJECT;
+    return var.type >= PP_VARTYPE_STRING;
   }
 
   // The cache of these objects.  The value is a shared pointer so that