Move have_wheel_event_handlers to WebLayerTreeView.

content/test/web_layer_tree_view_impl_for_testing.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/test/web_layer_tree_view_impl_for_testing.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/synchronization/lock.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 182 matching lines @@
                                            scoped_refptr<cc::Layer>());
 }
 
 void WebLayerTreeViewImplForTesting::registerSelection(
     const blink::WebSelection& selection) {
 }
 
 void WebLayerTreeViewImplForTesting::clearSelection() {
 }
 
+void WebLayerTreeViewImplForTesting::setHaveWheelEventHandlers(
+    bool have_event_handlers) {
+  layer_tree_host_->SetHaveWheelEventHandlers(have_event_handlers);
+}
+
 }  // namespace content