Minor clean up of objc's decl context stuff.
No change in functionality.

llvm-svn: 138742
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 2f2ba7f..e09896a 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -7780,7 +7780,7 @@
   Consumer.HandleTagDeclDefinition(Tag);
 }
 
-void Sema::ActOnObjCContainerFinishDefinition(Decl *IDecl) {
+void Sema::ActOnObjCContainerFinishDefinition() {
   // Exit this scope of this interface definition.
   PopDeclContext();
 }