Clean up .gypi and no-op GetCompositingSurface on TOUCH_UI.

chrome/browser/renderer_host/render_widget_host_view_views_gtk.cc

Index: chrome/browser/renderer_host/render_widget_host_view_views_gtk.cc
diff --git a/chrome/browser/renderer_host/render_widget_host_view_views_gtk.cc b/chrome/browser/renderer_host/render_widget_host_view_views_gtk.cc
index c3046645c91659619b7bf7586ad4b4a6c6df2c06..b3db85edf7fc746e16a95a27e38f00aae3597e7e 100644
--- a/chrome/browser/renderer_host/render_widget_host_view_views_gtk.cc
+++ b/chrome/browser/renderer_host/render_widget_host_view_views_gtk.cc
@@ -39,6 +39,7 @@ void RenderWidgetHostViewViews::AcceleratedCompositingActivated(
     NOTIMPLEMENTED();
 }
 
+#if !defined(TOUCH_UI)
 gfx::PluginWindowHandle RenderWidgetHostViewViews::GetCompositingSurface() {
   GtkNativeViewManager* manager = GtkNativeViewManager::GetInstance();
   gfx::PluginWindowHandle surface = gfx::kNullPluginWindow;
@@ -49,6 +50,7 @@ gfx::PluginWindowHandle RenderWidgetHostViewViews::GetCompositingSurface() {
   }
   return surface;
 }
+#endif
 
 gfx::NativeView RenderWidgetHostViewViews::GetInnerNativeView() const {
   // TODO(sad): Ideally this function should be equivalent to GetNativeView, and