plugin_vm: fix alignment of installer's message

Bug: 1048962
Change-Id: I759b75b58402d8754a47dfa361c5a7918453bd45
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2068401
Commit-Queue: Julian Watson <juwa@google.com>
Commit-Queue: Timothy Loh <timloh@chromium.org>
Auto-Submit: Julian Watson <juwa@google.com>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743876}

chrome/browser/ui/views/plugin_vm/plugin_vm_installer_view.cc

@@ -123,7 +123,7 @@ PluginVmInstallerView::PluginVmInstallerView(Profile* profile)
   views::BoxLayout* message_container_layout =
       message_container_view->SetLayoutManager(
           std::make_unique<views::BoxLayout>(
-              views::BoxLayout::Orientation::kHorizontal,
+              views::BoxLayout::Orientation::kVertical,
               gfx::Insets(kMessageHeight - kMessageFontSize, 0, 0, 0)));
   upper_container_view->AddChildView(message_container_view);