Convert //chrome/browser/ui from scoped_ptr to std::unique_ptr

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 8ee285007f52a31998f22264bbf8d06b0f7a5ad3..6448a8778693cf4a4085b38d2df9010883c42e84 100644
--- a/chrome/browser/ui/views/tab_dialogs_views.h
+++ b/chrome/browser/ui/views/tab_dialogs_views.h
@@ -26,7 +26,7 @@ class TabDialogsViews : public TabDialogs {
       ui::ProfileSigninConfirmationDelegate* delegate) override;
   void ShowManagePasswordsBubble(bool user_action) override;
   void HideManagePasswordsBubble() override;
-  scoped_ptr<ValidationMessageBubble> ShowValidationMessage(
+  std::unique_ptr<ValidationMessageBubble> ShowValidationMessage(
       const gfx::Rect& anchor_in_root_view,
       const base::string16& main_text,
       const base::string16& sub_text) override;