cc: Remove the software compositing bool from PrepareTextureMailbox

ui/compositor/layer.cc

Index: ui/compositor/layer.cc
diff --git a/ui/compositor/layer.cc b/ui/compositor/layer.cc
index 9accc1f3ab920799ae5b7c0e3e99037543cf1686..e8e79d2156c33adb73bf16a50dcbafa04469725c 100644
--- a/ui/compositor/layer.cc
+++ b/ui/compositor/layer.cc
@@ -822,8 +822,7 @@ size_t Layer::GetApproximateUnsharedMemoryUsage() const {
 
 bool Layer::PrepareTextureMailbox(
     cc::TextureMailbox* mailbox,
-    std::unique_ptr<cc::SingleReleaseCallback>* release_callback,
-    bool use_shared_memory) {
+    std::unique_ptr<cc::SingleReleaseCallback>* release_callback) {
   if (!mailbox_release_callback_)
     return false;
   *mailbox = mailbox_;