MacViews: add extension install dialog to MacViewsWebUIDialogs

chrome/browser/extensions/extension_install_prompt.h

Index: chrome/browser/extensions/extension_install_prompt.h
diff --git a/chrome/browser/extensions/extension_install_prompt.h b/chrome/browser/extensions/extension_install_prompt.h
index 13ee5bf851578b2fcb961c50c217e3a1eea6cc16..41a58c5655430471f8c17673248295a485e61f9c 100644
--- a/chrome/browser/extensions/extension_install_prompt.h
+++ b/chrome/browser/extensions/extension_install_prompt.h
@@ -260,6 +260,10 @@ class ExtensionInstallPrompt {
   // The implementations of this function are platform-specific.
   static ShowDialogCallback GetDefaultShowDialogCallback();
 
+  // Callback to show the Views extension install dialog. Don't use this; it is
+  // a temporary hack for MacViews.
+  static ShowDialogCallback GetViewsShowDialogCallback();
+
   // Returns the appropriate prompt type for the given |extension|.
   // TODO(devlin): This method is yucky - callers probably only care about one
   // prompt type. We just need to comb through and figure out what it is.