Remove the 2-level input method system & InputMethodBridge.

ui/views/cocoa/bridged_native_widget.h

Index: ui/views/cocoa/bridged_native_widget.h
diff --git a/ui/views/cocoa/bridged_native_widget.h b/ui/views/cocoa/bridged_native_widget.h
index 5f52831ecbbff6776393bc61fb7753c8dc3b1c1d..11d5b4cfc1a45f596d1f65688ad618ff44ee0eeb 100644
--- a/ui/views/cocoa/bridged_native_widget.h
+++ b/ui/views/cocoa/bridged_native_widget.h
@@ -15,7 +15,6 @@
 #import "ui/views/cocoa/bridged_native_widget_owner.h"
 #import "ui/views/cocoa/cocoa_mouse_capture_delegate.h"
 #import "ui/views/focus/focus_manager.h"
-#include "ui/views/ime/input_method_delegate.h"
 #include "ui/views/views_export.h"
 #include "ui/views/widget/widget.h"
 
@@ -29,7 +28,6 @@ class InputMethod;
 namespace views {
 
 class CocoaMouseCapture;
-class InputMethod;
 class NativeWidgetMac;
 class View;
 
@@ -38,7 +36,6 @@ class View;
 // NativeWidgetMac to the Cocoa window. Behaves a bit like an aura::Window.
 class VIEWS_EXPORT BridgedNativeWidget : public ui::LayerDelegate,
                                          public ui::LayerOwner,
-                                         public internal::InputMethodDelegate,
                                          public CocoaMouseCaptureDelegate,
                                          public FocusChangeListener,
                                          public ui::AcceleratedWidgetMacNSView,
@@ -142,8 +139,7 @@ class VIEWS_EXPORT BridgedNativeWidget : public ui::LayerDelegate,
   void OnSizeConstraintsChanged();
 
   // See widget.h for documentation.
-  InputMethod* CreateInputMethod();
-  ui::InputMethod* GetHostInputMethod();
+  ui::InputMethod* GetInputMethod();
 
   // The restored bounds will be derived from the current NSWindow frame unless
   // fullscreen or transitioning between fullscreen states.
@@ -169,9 +165,6 @@ class VIEWS_EXPORT BridgedNativeWidget : public ui::LayerDelegate,
   bool target_fullscreen_state() const { return target_fullscreen_state_; }
   bool window_visible() { return window_visible_; }
 
-  // Overridden from internal::InputMethodDelegate:
-  void DispatchKeyEventPostIME(const ui::KeyEvent& key) override;
-
  private:
   // Closes all child windows. BridgedNativeWidget children will be destroyed.
   void RemoveOrDestroyChildren();