Convert enable_plugins to a buildflag header.

content/common/pepper_renderer_instance_data.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_COMMON_PEPPER_RENDERER_INSTANCE_DATA_H_
 #define CONTENT_COMMON_PEPPER_RENDERER_INSTANCE_DATA_H_
 
+#include "ppapi/features/features.h"
 #include "url/gurl.h"
 
-#if !defined(ENABLE_PLUGINS)
+#if !BUILDFLAG(ENABLE_PLUGINS)
 #error "Plugins should be enabled"
 #endif
 
 namespace content {
 
 // This struct contains data which is associated with a particular plugin
 // instance and is related to the renderer in which the plugin instance lives.
 // This data is transferred to the browser process from the renderer when the
 // instance is created and is stored in the BrowserPpapiHost.
 struct PepperRendererInstanceData {
@@ skipping 10 matching lines @@
   GURL plugin_url;
   // Whether the plugin context is secure. That is, it is served from a secure
   // origin and it is embedded within a hierarchy of secure frames. This value
   // comes from the renderer so should not be trusted. It is used for metrics.
   bool is_potentially_secure_plugin_context;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_PEPPER_RENDERER_INSTANCE_DATA_H_