cc: Remove FinishAllRendering, as it doesn't do anything anymore.

cc/trees/threaded_channel.cc

Index: cc/trees/threaded_channel.cc
diff --git a/cc/trees/threaded_channel.cc b/cc/trees/threaded_channel.cc
index 67902aea94fc26c38cc7e2fcb47b3cdd60a8e695..0ee9469674b6b1295b003bd065f16160769a9d72 100644
--- a/cc/trees/threaded_channel.cc
+++ b/cc/trees/threaded_channel.cc
@@ -116,13 +116,6 @@ void ThreadedChannel::SetVisibleOnImpl(bool visible) {
       base::Bind(&ProxyImpl::SetVisibleOnImpl, proxy_impl_weak_ptr_, visible));
 }
 
-void ThreadedChannel::FinishAllRenderingOnImpl(CompletionEvent* completion) {
-  DCHECK(IsMainThread());
-  ImplThreadTaskRunner()->PostTask(
-      FROM_HERE, base::Bind(&ProxyImpl::FinishAllRenderingOnImpl,
-                            proxy_impl_weak_ptr_, completion));
-}
-
 void ThreadedChannel::ReleaseOutputSurfaceOnImpl(CompletionEvent* completion) {
   DCHECK(IsMainThread());
   ImplThreadTaskRunner()->PostTask(