Remove the 2-level input method system & InputMethodBridge.

ui/base/ime/text_input_client.h

Index: ui/base/ime/text_input_client.h
diff --git a/ui/base/ime/text_input_client.h b/ui/base/ime/text_input_client.h
index 736a14b4db9108862f212d199176cd96df0a174e..aea24b2984920f5e191e7dfd6a44efdc703fff0f 100644
--- a/ui/base/ime/text_input_client.h
+++ b/ui/base/ime/text_input_client.h
@@ -57,9 +57,6 @@ class UI_BASE_IME_EXPORT TextInputClient {
 
   // Input context information -------------------------------------------------
 
-  // Returns native window to which input context is bound.
-  virtual gfx::NativeWindow GetAttachedWindow() const = 0;
-
   // Returns current text input type. It could be changed and even becomes
   // TEXT_INPUT_TYPE_NONE at runtime.
   virtual ui::TextInputType GetTextInputType() const = 0;