Update from https://crrev.com/320343

cc/trees/thread_proxy.cc

Index: cc/trees/thread_proxy.cc
diff --git a/cc/trees/thread_proxy.cc b/cc/trees/thread_proxy.cc
index 8c766f273da9ab0a291133710fed1a7e10b27968..74525200458415e93836061199d5e2221475ab4f 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -1252,31 +1252,6 @@ ThreadProxy::BeginMainFrameAndCommitState::BeginMainFrameAndCommitState()
 
 ThreadProxy::BeginMainFrameAndCommitState::~BeginMainFrameAndCommitState() {}
 
-void ThreadProxy::AsValueInto(base::trace_event::TracedValue* state) const {
-  CompletionEvent completion;
-  {
-    DebugScopedSetMainThreadBlocked main_thread_blocked(
-        const_cast<ThreadProxy*>(this));
-    scoped_refptr<base::trace_event::TracedValue> state_refptr(state);
-    Proxy::ImplThreadTaskRunner()->PostTask(
-        FROM_HERE,
-        base::Bind(&ThreadProxy::AsValueOnImplThread,
-                   impl_thread_weak_ptr_,
-                   &completion,
-                   state_refptr));
-    completion.Wait();
-  }
-}
-
-void ThreadProxy::AsValueOnImplThread(
-    CompletionEvent* completion,
-    base::trace_event::TracedValue* state) const {
-  state->BeginDictionary("layer_tree_host_impl");
-  impl().layer_tree_host_impl->AsValueInto(state);
-  state->EndDictionary();
-  completion->Signal();
-}
-
 bool ThreadProxy::MainFrameWillHappenForTesting() {
   DCHECK(IsMainThread());
   CompletionEvent completion;