chrome: Cleanup class/struct forward declarations

chrome/browser/ui/views/ime/ime_window_view.h

Index: chrome/browser/ui/views/ime/ime_window_view.h
diff --git a/chrome/browser/ui/views/ime/ime_window_view.h b/chrome/browser/ui/views/ime/ime_window_view.h
index a68ff95e7adf5a6faec0f0b33726d1a22e097f6a..a36368786068ade57529239eec4f46e37a46ed7e 100644
--- a/chrome/browser/ui/views/ime/ime_window_view.h
+++ b/chrome/browser/ui/views/ime/ime_window_view.h
@@ -20,12 +20,6 @@
 #include "ui/views/widget/widget_delegate.h"
 #include "ui/views/widget/widget_observer.h"
 
-class Profile;
-
-namespace extensions {
-class Extension;
-}
-
 namespace views {
 class WebView;
 }
@@ -33,7 +27,6 @@ class WebView;
 namespace ui {
 
 class ImeWindowFrameView;
-class ImeWindowHost;
 
 // The views implementation for the IME window UI.
 // This interacts with ImeWindow through the ImeNativeWindow interface.