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

cc/trees/single_thread_proxy.cc

Index: cc/trees/single_thread_proxy.cc
diff --git a/cc/trees/single_thread_proxy.cc b/cc/trees/single_thread_proxy.cc
index b0c1abb49cec45b7d2369677c5a325fe490ed1f7..ea3a2b99015f16dfb2ed77b750182b098905a70d 100644
--- a/cc/trees/single_thread_proxy.cc
+++ b/cc/trees/single_thread_proxy.cc
@@ -108,15 +108,6 @@ SingleThreadProxy::~SingleThreadProxy() {
   DCHECK(!layer_tree_host_impl_);
 }
 
-void SingleThreadProxy::FinishAllRendering() {
-  TRACE_EVENT0("cc", "SingleThreadProxy::FinishAllRendering");
-  DCHECK(task_runner_provider_->IsMainThread());
-  {
-    DebugScopedSetImplThread impl(task_runner_provider_);
-    layer_tree_host_impl_->FinishAllRendering();
-  }
-}
-
 bool SingleThreadProxy::IsStarted() const {
   DCHECK(task_runner_provider_->IsMainThread());
   return !!layer_tree_host_impl_;