Improve & simplify diagnostic for missing 'class' in template template parameter.

Change suggested by Sebastian Redl on review feedback from r153887.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154102 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Parser/cxx-template-decl.cpp b/test/Parser/cxx-template-decl.cpp
index 72f2d7d..af3eb2d 100644
--- a/test/Parser/cxx-template-decl.cpp
+++ b/test/Parser/cxx-template-decl.cpp
@@ -11,8 +11,8 @@
 // expected-warning {{declaration does not declare anything}}
 template <template X> struct Err1; // expected-error {{expected '<' after 'template'}} \
 // expected-error{{extraneous}}
-template <template <typename> > struct Err2;       // expected-error {{expected 'class' before '>'}}
-template <template <typename> Foo> struct Err3;    // expected-error {{expected 'class' before 'Foo'}}
+template <template <typename> > struct Err2;       // expected-error {{template template parameters require 'class' after the argument list}}
+template <template <typename> Foo> struct Err3;    // expected-error {{template template parameters require 'class' after the argument list}}
 
 // Template function declarations
 template <typename T> void foo();