Fix Win, Gtk, Qt bustage.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@36912 268f45cc-cd09-0410-ab3c-d52691b4dbfc
diff --git a/WebCore/platform/ScrollView.cpp b/WebCore/platform/ScrollView.cpp
index aa3922f..af9cb68 100644
--- a/WebCore/platform/ScrollView.cpp
+++ b/WebCore/platform/ScrollView.cpp
@@ -85,7 +85,7 @@
 #endif
 
 #if !PLATFORM(MAC) && !PLATFORM(WX)
-IntRect ScrollView::platformVisibleContentRect(bool)
+IntRect ScrollView::platformVisibleContentRect(bool) const
 {
 }
 #endif