Make a clean interface for dialog callbacks.

chrome/browser/extensions/extension_host.cc

Index: chrome/browser/extensions/extension_host.cc
diff --git a/chrome/browser/extensions/extension_host.cc b/chrome/browser/extensions/extension_host.cc
index 6eeb05f7c46df28df89fdf5630e4208d233fde75..88f6b93c324d5db5e5cf27c68947d3572e1cee1f 100644
--- a/chrome/browser/extensions/extension_host.cc
+++ b/chrome/browser/extensions/extension_host.cc
@@ -478,14 +478,6 @@ gfx::NativeWindow ExtensionHost::GetDialogRootWindow() {
   return NULL;
 }
 
-TabContents* ExtensionHost::AsTabContents() {
-  return NULL;
-}
-
-ExtensionHost* ExtensionHost::AsExtensionHost() {
-  return this;
-}
-
 void ExtensionHost::OnDialogClosed(IPC::Message* reply_msg,
                                    bool success,
                                    const string16& user_input) {