views: implement width snapping for DialogDelegateViews

chrome/browser/ui/views/importer/import_lock_dialog_view.h

Index: chrome/browser/ui/views/importer/import_lock_dialog_view.h
diff --git a/chrome/browser/ui/views/importer/import_lock_dialog_view.h b/chrome/browser/ui/views/importer/import_lock_dialog_view.h
index c69140a9c6a6691db284bbd791980c33cf77a3b9..d8c2613f6a57c13c30085d91996038996f0f621a 100644
--- a/chrome/browser/ui/views/importer/import_lock_dialog_view.h
+++ b/chrome/browser/ui/views/importer/import_lock_dialog_view.h
@@ -28,9 +28,11 @@ class ImportLockDialogView : public views::DialogDelegateView {
   ~ImportLockDialogView() override;
 
   // views::View:

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

Nit: This doesn't directly subclass View or DialogDelegate, put all three
override groups together

-  gfx::Size GetPreferredSize() const override;
   void Layout() override;
 
+  // views::DialogDelegateView:
+  gfx::Size GetUnsnappedPreferredSize() const override;
+
   // views::DialogDelegate:
   base::string16 GetDialogButtonLabel(ui::DialogButton button) const override;
   base::string16 GetWindowTitle() const override;