Refactoring for the InputMethod & InputMethodDelegate interfaces.

ash/display/window_tree_host_manager.cc

Index: ash/display/window_tree_host_manager.cc
diff --git a/ash/display/window_tree_host_manager.cc b/ash/display/window_tree_host_manager.cc
index 77bec60e92982701048c3552cccbd5c0490f575e..af7d17c4b82fe83ed96b45672a5538f0b8d3301a 100644
--- a/ash/display/window_tree_host_manager.cc
+++ b/ash/display/window_tree_host_manager.cc
@@ -862,7 +862,8 @@ void WindowTreeHostManager::PostDisplayConfigurationChange() {
   UpdateMouseLocationAfterDisplayChange();
 }
 
-bool WindowTreeHostManager::DispatchKeyEventPostIME(const ui::KeyEvent& event) {
+ui::EventDispatchDetails WindowTreeHostManager::DispatchKeyEventPostIME(
+    ui::KeyEvent* event) {
   // Getting the active root window to dispatch the event. This isn't
   // significant as the event will be sent to the window resolved by
   // aura::client::FocusClient which is FocusController in ash.