Use 48x48 rather than 32x32 for Logo in Crostini Installer view

This mitigates pixelisation in the Tux logo when rendered in the Crostini
installer.

Bug: 896540
Change-Id: I1f96206701dcfccef4f806a67adbdb5af9f6fa12
Reviewed-on: https://chromium-review.googlesource.com/c/1288109Reviewed-by: Nicholas Verne <nverne@chromium.org>
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600655}

chrome/browser/ui/views/crostini/crostini_installer_view.cc

@@ -318,7 +318,7 @@ CrostiniInstallerView::CrostiniInstallerView(Profile* profile)
   // Layout constants from the spec.
   constexpr gfx::Insets kDialogInsets(60, 64, 32, 64);
   constexpr int kDialogSpacingVertical = 32;
-  constexpr gfx::Size kLogoImageSize(32, 32);
+  constexpr gfx::Size kLogoImageSize(48, 48);
 
   views::BoxLayout* layout =
       SetLayoutManager(std::make_unique<views::BoxLayout>(