aura: Remove WindowTreeHost::QueryMouseLocation().

ui/aura/test/aura_test_utils.cc

+// Copyright 2014 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 "ui/aura/test/aura_test_utils.h"
+
+#include "ui/aura/window_tree_host.h"
+
+namespace aura {
+namespace test {
+
+class WindowTreeHostTestApi {
+ public:
+  explicit WindowTreeHostTestApi(WindowTreeHost* host) : host_(host) {}
+
+  const gfx::Point& last_cursor_request_position_in_host() {
+    return host_->last_cursor_request_position_in_host_;
+  }
+
+ private:
+  WindowTreeHost* host_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowTreeHostTestApi);
+};
+
+const gfx::Point& QueryLatestMousePositionRequestInHost(WindowTreeHost* host) {
+  WindowTreeHostTestApi host_test_api(host);
+  return host_test_api.last_cursor_request_position_in_host();
+}
+
+}  // namespace test
+}  // namespace aura