base: Don't generate unused BoundFunctorTraits typedef

base/bind.h.pump

Index: base/bind.h.pump
diff --git a/base/bind.h.pump b/base/bind.h.pump
index b321649aea6fbf3f4e5db3153c5983f060a90c22..2cdd7d5e49857eda6dc86a3d29abe6dc1247c5c9 100644
--- a/base/bind.h.pump
+++ b/base/bind.h.pump
@@ -93,14 +93,14 @@ $if ARITY > 0 [[, ]] $for ARG , [[const P$(ARG)& p$(ARG)]]) {
   typedef typename internal::FunctorTraits<Functor>::RunnableType RunnableType;
   typedef typename internal::FunctorTraits<Functor>::RunType RunType;
 
+$if ARITY > 0 [[
+
   // Use RunnableType::RunType instead of RunType above because our
   // checks should below for bound references need to know what the actual
   // functor is going to interpret the argument as.
   typedef internal::FunctionTraits<typename RunnableType::RunType>
       BoundFunctorTraits;
 
-$if ARITY > 0 [[
-
   // Do not allow binding a non-const reference parameter. Non-const reference
   // parameters are disallowed by the Google style guide.  Also, binding a
   // non-const reference parameter can make for subtle bugs because the