Invert Print Preview manage icon in RTL

The icon isn't a <cr-icon-button>, so it doesn't already have styling
for RTL inversion.

Fixed: 1146941
Change-Id: I5267cdecc6da48c3167c44d81904dac963d008d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2528919Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825979}

chrome/browser/resources/print_preview/ui/destination_dialog.html

 <style include="print-preview-shared action-link md-select cr-hidden-style
     throbber">
+  :host-context([dir=rtl]) #manageIcon {
+    transform: scaleX(-1);
+  }
+
   #dialog::part(dialog) {
     height: calc(100vh - 2 * var(--print-preview-dialog-margin));
     max-width: 640px;
@@ -152,7 +156,7 @@
   <div slot="button-container">
     <cr-button on-click="onManageButtonClick_">
       $i18n{manage}
-      <iron-icon icon="cr:open-in-new"></iron-icon>
+      <iron-icon icon="cr:open-in-new" id="manageIcon"></iron-icon>
     </cr-button>
     <cr-button class="cancel-button" on-click="onCancelButtonClick_">
       $i18n{cancel}