Update read later button horizontal alignment to match other bookmarks bar buttons.

Bug: 1109316
Change-Id: I65ff9feff3fff55a159eaf488c1a71cdbf29662a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480803Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Caroline Rising <corising@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818021}

chrome/browser/ui/views/read_later/read_later_button.cc

@@ -29,6 +29,7 @@ ReadLaterButton::ReadLaterButton(Browser* browser)
   GetViewAccessibility().OverrideHasPopup(ax::mojom::HasPopup::kMenu);
   button_controller()->set_notify_action(
       views::ButtonController::NotifyAction::kOnPress);
+  SetHorizontalAlignment(gfx::ALIGN_LEFT);
   // We don't want to use ToolbarButton::SetHighlight here because it adds a
   // border around the button.
   LabelButton::SetText(l10n_util::GetStringUTF16(IDS_READ_LATER_TITLE));