FBTF: Move individual XXXMsg_Params structs to a new file.

ipc/ipc_message_utils.h

Index: ipc/ipc_message_utils.h
diff --git a/ipc/ipc_message_utils.h b/ipc/ipc_message_utils.h
index 75b80ae3b8f861670c1377e9d2ac865ada374888..34e257a504323000005d5dfaa2ae4e1ad413f4b4 100644
--- a/ipc/ipc_message_utils.h
+++ b/ipc/ipc_message_utils.h
@@ -16,6 +16,7 @@
 #include "base/string16.h"
 #include "base/string_util.h"
 #include "base/tuple.h"
+#include "ipc/ipc_param_traits.h"
 #include "ipc/ipc_sync_message.h"
 
 #if defined(COMPILER_GCC)
@@ -132,14 +133,6 @@ class MessageIterator {
 //-----------------------------------------------------------------------------
 // ParamTraits specializations, etc.
 
-template <class P> struct ParamTraits {
-};
-
-template <class P>
-struct SimilarTypeTraits {
-  typedef P Type;
-};
-
 template <class P>
 static inline void WriteParam(Message* m, const P& p) {
   typedef typename SimilarTypeTraits<P>::Type Type;