prune down content_dll change to just the CONTENT_EXPORTS

content/renderer/p2p/host_address_request.h

Index: content/renderer/p2p/host_address_request.h
diff --git a/content/renderer/p2p/host_address_request.h b/content/renderer/p2p/host_address_request.h
index 72789aa96c4a979271d16ad4ef7bb5a9f13ab8c5..9a3de71844ead568af1456f87191d2e962bf3a53 100644
--- a/content/renderer/p2p/host_address_request.h
+++ b/content/renderer/p2p/host_address_request.h
@@ -9,6 +9,7 @@
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
+#include "content/common/content_export.h"
 #include "net/base/net_util.h"
 
 namespace base {
@@ -24,8 +25,8 @@ class P2PSocketDispatcher;
 //
 // TODO(sergeyu): Name of this class may be confusing. Rename it to
 // something else, e.g. P2PHostnameResolver.
-class P2PHostAddressRequest :
-    public base::RefCountedThreadSafe<P2PHostAddressRequest>  {
+class CONTENT_EXPORT P2PHostAddressRequest
+    : public base::RefCountedThreadSafe<P2PHostAddressRequest>  {
  public:
   typedef base::Callback<void(const net::IPAddressNumber&)> DoneCallback;