--- chrome/browser/plugin_process_host.h
+++ chrome/browser/plugin_process_host.h
@@ -119,7 +119,7 @@ class PluginProcessHost : public ChildProcessHost,
   base::ProcessHandle InitHelperPosix(const CommandLine& cmd_line);
 #endif
 
-#if defined(OS_LINUX)
+#if defined(USE_X11)
   void OnMapNativeViewId(gfx::NativeViewId id, gfx::PluginWindowHandle* output);
 #endif
 
diff --git chrome/browser/process_singleton.h chrome/browser/process_singleton.h
index 76c9c22..5cbfbe8 100644