Remove the 2-level input method system & InputMethodBridge.

ui/base/ime/dummy_text_input_client.cc

Index: ui/base/ime/dummy_text_input_client.cc
diff --git a/ui/base/ime/dummy_text_input_client.cc b/ui/base/ime/dummy_text_input_client.cc
index 8ffafe08bc0a947faf65e940751040de38fa2152..c660bd9269b32081df0ddfda616e332c08a5eff8 100644
--- a/ui/base/ime/dummy_text_input_client.cc
+++ b/ui/base/ime/dummy_text_input_client.cc
@@ -32,10 +32,6 @@ void DummyTextInputClient::InsertText(const base::string16& text) {
 void DummyTextInputClient::InsertChar(base::char16 ch, int flags) {
 }
 
-gfx::NativeWindow DummyTextInputClient::GetAttachedWindow() const {
-  return NULL;
-}
-
 TextInputType DummyTextInputClient::GetTextInputType() const {
   return text_input_type_;
 }