Remove the 2-level input method system & InputMethodBridge.

ui/aura/test/test_window_delegate.cc

Index: ui/aura/test/test_window_delegate.cc
diff --git a/ui/aura/test/test_window_delegate.cc b/ui/aura/test/test_window_delegate.cc
index 4b0f8b77a03ded1928c71e9ca7bac16e1e2daca2..f45b821a63b43391e8773cb4ebcb05d70cbd52d3 100644
--- a/ui/aura/test/test_window_delegate.cc
+++ b/ui/aura/test/test_window_delegate.cc
@@ -51,10 +51,6 @@ void TestWindowDelegate::OnBoundsChanged(const gfx::Rect& old_bounds,
                                          const gfx::Rect& new_bounds) {
 }
 
-ui::TextInputClient* TestWindowDelegate::GetFocusedTextInputClient() {
-  return &text_input_client_;
-}
-
 gfx::NativeCursor TestWindowDelegate::GetCursor(const gfx::Point& point) {
   return gfx::kNullCursor;
 }