views: implement width snapping for DialogDelegateViews

chrome/browser/ui/views/extensions/extension_popup.h

Index: chrome/browser/ui/views/extensions/extension_popup.h
diff --git a/chrome/browser/ui/views/extensions/extension_popup.h b/chrome/browser/ui/views/extensions/extension_popup.h
index b820faa7ae509ae9afb4d076d98b5ad8ae288cf2..33db8c0e6ded6a428ef888955d3a371e792f75ab 100644
--- a/chrome/browser/ui/views/extensions/extension_popup.h
+++ b/chrome/browser/ui/views/extensions/extension_popup.h
@@ -70,10 +70,12 @@ class ExtensionPopup : public views::BubbleDialogDelegateView,
   void OnExtensionSizeChanged(ExtensionViewViews* view) override;
 
   // views::View overrides.

[Peter Kasting, 2017/03/30 00:35:35]

This class doesn't directly subclass View or DialogDelegateView, so really all
those overrides belong with the BubbleDialogDelegateView overrides.

-  gfx::Size GetPreferredSize() const override;
   void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) override;
 
+  // views::DialogDelegateView overrides.
+  gfx::Size GetUnsnappedPreferredSize() const override;
+
   // views::WidgetObserver overrides.
   void OnWidgetActivationChanged(views::Widget* widget, bool active) override;