cc: Remove the software compositing bool from PrepareTextureMailbox

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index dc40c631ef0130225ab358f76f13d3fa4e88b8e4..050f265a80031e7511d65b5d2ab73adc81dec0b8 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -748,10 +748,6 @@ void LayerTreeHost::BuildPropertyTreesForTesting() {
       layer_tree_->property_trees());
 }
 
-bool LayerTreeHost::UsingSharedMemoryResources() {
-  return GetRendererCapabilities().using_shared_memory_resources;
-}
-
 bool LayerTreeHost::DoUpdateLayers(Layer* root_layer) {
   TRACE_EVENT1("cc", "LayerTreeHost::DoUpdateLayers", "source_frame_number",
                source_frame_number());