Export some unix-specific content symbols

content/browser/renderer_host/render_sandbox_host_linux.h

Index: content/browser/renderer_host/render_sandbox_host_linux.h
diff --git a/content/browser/renderer_host/render_sandbox_host_linux.h b/content/browser/renderer_host/render_sandbox_host_linux.h
index 8a4d0aa1164cb4f3158f9f87bb62b0f895005ac9..83e9307fb6e13c262ab71f2de53aeeccfe5684cc 100644
--- a/content/browser/renderer_host/render_sandbox_host_linux.h
+++ b/content/browser/renderer_host/render_sandbox_host_linux.h
@@ -11,12 +11,13 @@
 #include <string>
 
 #include "base/logging.h"
+#include "content/common/content_export.h"
 
 template <typename T> struct DefaultSingletonTraits;
 
 // This is a singleton object which handles sandbox requests from the
 // renderers.
-class RenderSandboxHostLinux {
+class CONTENT_EXPORT RenderSandboxHostLinux {
  public:
   // Returns the singleton instance.
   static RenderSandboxHostLinux* GetInstance();