cc: Break up with FakeLayerTreeHostClient.

cc/test/stub_layer_tree_host_client.cc

Index: cc/test/stub_layer_tree_host_client.cc
diff --git a/cc/proto/vector2d.proto b/cc/test/stub_layer_tree_host_client.cc
similarity index 53%
copy from cc/proto/vector2d.proto
copy to cc/test/stub_layer_tree_host_client.cc
index 15171844ffc443d28cae7c70e2149ac3989200ab..650faaf772cd194b807676ff78ed25ba1d57e7d6 100644
--- a/cc/proto/vector2d.proto
+++ b/cc/test/stub_layer_tree_host_client.cc
@@ -2,13 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-syntax = "proto2";
+#include "cc/test/stub_layer_tree_host_client.h"
 
-option optimize_for = LITE_RUNTIME;
+namespace cc {
 
-package cc.proto;
+StubLayerTreeHostClient::~StubLayerTreeHostClient() = default;
 
-message Vector2d {
-  optional int64 x = 1;
-  optional int64 y = 2;
-}
+}  // namespace cc