Renames aura::client::WindowTreeClient to WindowParentingClient

headless/lib/browser/headless_browser_impl.h

Index: headless/lib/browser/headless_browser_impl.h
diff --git a/headless/lib/browser/headless_browser_impl.h b/headless/lib/browser/headless_browser_impl.h
index a31391816c04ef7a65d968b5cc5028b55c293888..74a4b6c29cf3e0ee0ae47233e6695459111e8725 100644
--- a/headless/lib/browser/headless_browser_impl.h
+++ b/headless/lib/browser/headless_browser_impl.h
@@ -20,7 +20,7 @@ namespace aura {
 class WindowTreeHost;
 
 namespace client {
-class WindowTreeClient;
+class WindowParentingClient;
 }
 }
 
@@ -78,7 +78,7 @@ class HeadlessBrowserImpl : public HeadlessBrowser {
   // is used for all web contents. We should probably use one
   // window per web contents, but additional investigation is needed.
   std::unique_ptr<aura::WindowTreeHost> window_tree_host_;
-  std::unique_ptr<aura::client::WindowTreeClient> window_tree_client_;
+  std::unique_ptr<aura::client::WindowParentingClient> window_parenting_client_;
 
   std::unordered_map<std::string, std::unique_ptr<HeadlessBrowserContextImpl>>
       browser_contexts_;