Bug 1480457 Address template parameter shadowing r=aklotz

This code throws an error in clang on the inner MMPolicy:
error: declaration of 'MMPolicy' shadows template parameter

Notethat the template parameter is declared earlier at the
class definition of ReadOnlyTargetFunction

MozReview-Commit-ID: buLE9d22YS

Differential Revision: https://phabricator.services.mozilla.com/D4571

--HG--
extra : moz-landing-system : lando

mozglue/misc/interceptor/TargetFunction.h

@@ -808,8 +808,8 @@ private:
   template <typename T>
   struct ChasePointerHelper
   {
-    template <typename MMPolicy>
-    static T Result(const MMPolicy&, T aValue)
+    template <typename MMPolicy_>
+    static T Result(const MMPolicy_&, T aValue)
     {
       return aValue;
     }
@@ -818,10 +818,10 @@ private:
   template <typename T>
   struct ChasePointerHelper<T*>
   {
-    template <typename MMPolicy>
-    static auto Result(const MMPolicy& aPolicy, T* aValue)
+    template <typename MMPolicy_>
+    static auto Result(const MMPolicy_& aPolicy, T* aValue)
     {
-      ReadOnlyTargetFunction<MMPolicy> ptr(aPolicy, aValue);
+      ReadOnlyTargetFunction<MMPolicy_> ptr(aPolicy, aValue);
       return ptr.template ChasePointer<T>();
     }
   };