Remove InputMethodEventHandler.

ui/base/ime/input_method_base.cc

 // Copyright (c) 2012 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/base/ime/input_method_base.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 114 matching lines @@
 
 void InputMethodBase::OnInputMethodChanged() const {
   TextInputClient* client = GetTextInputClient();
   if (!IsTextInputTypeNone())
     client->OnInputMethodChanged();
 }
 
 ui::EventDispatchDetails InputMethodBase::DispatchKeyEventPostIME(
     ui::KeyEvent* event) const {
   ui::EventDispatchDetails details;
-  if (delegate_)
+  if (delegate_) {
+    event->set_skip_ime(true);

[sadrul, 2017/05/15 14:44:24]

Instead of turning the flag on here, can WindowTreeHost notify that
WindowEventDispatcher whether or not to dispatch the key-event to ime?

[Hadi, 2017/05/15 17:22:13]

Done.

     details = delegate_->DispatchKeyEventPostIME(event);
+  }
   return details;
 }
 
 void InputMethodBase::NotifyTextInputStateChanged(
     const TextInputClient* client) {
   for (InputMethodObserver& observer : observer_list_)
     observer.OnTextInputStateChanged(client);
 }
 
 void InputMethodBase::NotifyTextInputCaretBoundsChanged(
@@ skipping 84 matching lines @@
 InputMethod* InputMethodBase::GetInputMethod() {
   return this;
 }
 
 const std::vector<std::unique_ptr<ui::KeyEvent>>&
 InputMethodBase::GetKeyEventsForTesting() {
   return key_events_for_testing_;
 }
 
 }  // namespace ui