Address more TOOD(GYP) in GN build.

media/cdm/ppapi/ppapi_cdm_adapter.gni

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This template defines a CDM adapter target. Just use this as you would a
 # normal target and everything should work correctly. If GYP, you would instead
 # depend on media/media_cdm_adapter.gyp:cdmadapter which would in turn modify
 # your target with direct_dependent_settings.
 template("ppapi_cdm_adapter") {
-  # TODO(GYP) On Mac/Linux this should be a loadable_module.
-  shared_library(target_name) {
+  if (is_win) {
+    ppapi_cdm_adapter_target_type = "shared_library"
+  } else {
+    ppapi_cdm_adapter_target_type = "loadable_module"
+  }
+
+  target(ppapi_cdm_adapter_target_type, target_name) {
     # Don't filter sources list again.
     set_sources_assignment_filter([])
     cflags = []
     sources = []
     ldflags = []
     libs = []
     forward_variables_from(invoker, "*")
 
     defines += [ "USE_PPAPI_CDM_ADAPTER" ]
     deps += [
@@ skipping 33 matching lines @@
 
     if (is_linux && !is_component_build) {
       # CDM adapter depends on a CDM even in non-component builds.
       configs += [ "//build/config/gcc:rpath_for_built_shared_libraries" ]
     }
 
     # TODO(jschuh) crbug.com/167187
     configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
   }
 }