Mac: Convert all the TabDialogs to Harmony

chrome/browser/ui/views/tab_dialogs_views.h

Index: chrome/browser/ui/views/tab_dialogs_views.h
diff --git a/chrome/browser/ui/views/tab_dialogs_views.h b/chrome/browser/ui/views/tab_dialogs_views.h
index 83f4e473fdeb4e98cb95615cc4781d23cf1dde02..88eaf33de7cb3b632feea2e4697627c3d07bc1ef 100644
--- a/chrome/browser/ui/views/tab_dialogs_views.h
+++ b/chrome/browser/ui/views/tab_dialogs_views.h
@@ -32,6 +32,9 @@ class TabDialogsViews : public TabDialogs {
       const base::string16& main_text,
       const base::string16& sub_text) override;
 
+ protected:
+  content::WebContents* web_contents() const { return web_contents_; }
+
  private:
   content::WebContents* web_contents_;  // Weak. Owns this.