Fix crash when displaying system print dialog on Linux.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index d99ffb54168a4dcc812016cbae94ea3ecf27fa97..a5a40d66cfc84ddb6d9dcb77d489d2a780fe411f 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -3737,10 +3737,6 @@ gfx::Size RenderViewImpl::GetSize() const {
   return size();
 }
 
-gfx::NativeViewId RenderViewImpl::GetHostWindow() const {
-  return host_window();
-}
-
 WebPreferences& RenderViewImpl::GetWebkitPreferences() {
   return webkit_preferences_;
 }