[gtk+] Fix "make install"

[Paolo Borelli <pborelli src gnome org>]

commit 88e2c0ee69c34b6ff5da9949946f6b7ec3b07494
Author: Paolo Borelli <pborelli gnome org>
Date:   Sat Nov 2 12:15:34 2013 +0100

    Fix "make install"
    
    These files were listed twice

 testsuite/reftests/Makefile.am |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/testsuite/reftests/Makefile.am b/testsuite/reftests/Makefile.am
index 4353fc5..de1e117 100644
--- a/testsuite/reftests/Makefile.am
+++ b/testsuite/reftests/Makefile.am
@@ -67,9 +67,6 @@ testdata = \
        background-size-zero.css \
        background-size-zero.ref.ui \
        background-size-zero.ui \
-       background-size.css \
-       background-size.ref.ui \
-       background-size.ui \
        background-window-transparent.css \
        background-window-transparent.ref.ui \
        background-window-transparent.ui \