Removes the redundant IMB::OnFocus call in DNWA::HandleNativeFocus().

ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
index cfd6d1065731bdd5c52bb2c3af7295b795b9a198..e4d4069569d73169faac7b3a7f735fac9d063f0f 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc
@@ -820,16 +820,10 @@ void DesktopWindowTreeHostWin::HandleFrameChanged() {
 
 void DesktopWindowTreeHostWin::HandleNativeFocus(HWND last_focused_window) {
   // TODO(beng): inform the native_widget_delegate_.

[sky, 2015/05/22 17:29:02]

I think it's worth a comment here as to why you don't need to call to
InputMethod.

[Shu Chen, 2015/05/25 01:14:25]

Thanks for your comment. My later cl soon to refactor the IMF (ownership change
for InputMethod) will make window tree host to call OnFocus/OnBlur of
InputMethod.

-  InputMethod* input_method = GetInputMethod();
-  if (input_method)
-    input_method->OnFocus();
 }
 
 void DesktopWindowTreeHostWin::HandleNativeBlur(HWND focused_window) {
   // TODO(beng): inform the native_widget_delegate_.
-  InputMethod* input_method = GetInputMethod();
-  if (input_method)
-    input_method->OnBlur();
 }

[sadrul, 2015/05/16 02:24:25]

The X11 version seems to still do this (e.g.
DesktopWindowTreeHostX11::OnNativeWidgetFocus(), OnNativeWidgetBlur()). Should
those be removed too?

[Shu Chen, 2015/05/20 06:30:52]

Let's limit the scope of this change in Windows platform. Could change for X11
separately if we confirm this fix is correct and DWTHX11::OnNativeWidgetFocus()
can be removed.

 
 bool DesktopWindowTreeHostWin::HandleMouseEvent(const ui::MouseEvent& event) {