views: don't snap dialogs with no buttons

ui/views/bubble/bubble_dialog_delegate.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_BUBBLE_BUBBLE_DIALOG_DELEGATE_H_
 #define UI_VIEWS_BUBBLE_BUBBLE_DIALOG_DELEGATE_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "ui/views/bubble/bubble_border.h"
@@ skipping 21 matching lines @@
     DEACTIVATION,
     CLOSE_BUTTON,
     UNKNOWN,
   };
 
   ~BubbleDialogDelegateView() override;
 
   // Create and initialize the bubble Widget(s) with proper bounds.
   static Widget* CreateBubble(BubbleDialogDelegateView* bubble_delegate);
 
+  // DialogDelegateView overrides:
+  bool ShouldSnapFrameWidth() const override;
+
   // WidgetDelegateView overrides:
   BubbleDialogDelegateView* AsBubbleDialogDelegate() override;
   bool ShouldShowCloseButton() const override;
   ClientView* CreateClientView(Widget* widget) override;
   NonClientFrameView* CreateNonClientFrameView(Widget* widget) override;
   const char* GetClassName() const override;
 
   // WidgetObserver overrides:
   void OnWidgetDestroying(Widget* widget) override;
   void OnWidgetVisibilityChanging(Widget* widget, bool visible) override;
@@ skipping 155 matching lines @@
 
   // Parent native window of the bubble.
   gfx::NativeView parent_window_;
 
   DISALLOW_COPY_AND_ASSIGN(BubbleDialogDelegateView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BUBBLE_BUBBLE_DELEGATE2_H_