Convert enable_plugins to a buildflag header.

content/browser/renderer_host/pepper/browser_ppapi_host_impl.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_BROWSER_RENDERER_HOST_PEPPER_BROWSER_PPAPI_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_PEPPER_BROWSER_PPAPI_HOST_IMPL_H_
 
 #include <map>
 #include <string>
 #include <utility>
 
 #include "base/compiler_specific.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/process/process.h"
 #include "content/browser/renderer_host/pepper/content_browser_pepper_host_factory.h"
 #include "content/browser/renderer_host/pepper/ssl_context_helper.h"
 #include "content/common/content_export.h"
 #include "content/common/pepper_renderer_instance_data.h"
 #include "content/public/browser/browser_ppapi_host.h"
 #include "content/public/common/process_type.h"
 #include "ipc/message_filter.h"
+#include "ppapi/features/features.h"
 #include "ppapi/host/ppapi_host.h"
 
-#if !defined(ENABLE_PLUGINS)
+#if !BUILDFLAG(ENABLE_PLUGINS)
 #error "Plugins should be enabled"
 #endif
 
 namespace content {
 
 class CONTENT_EXPORT BrowserPpapiHostImpl : public BrowserPpapiHost {
  public:
   class InstanceObserver {
    public:
     // Called when the plugin instance is throttled or unthrottled because of
@@ skipping 127 matching lines @@
   scoped_refptr<HostMessageFilter> message_filter_;
 
   BrowserPpapiHost::OnKeepaliveCallback on_keepalive_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPpapiHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_PEPPER_BROWSER_PPAPI_HOST_IMPL_H_