oobe-adaptive-dialog: remove layer of divs in proxy object.

Bug: 1151292
Change-Id: I318dcff8ec10a721844856ff089e59ef68f8a09b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601484Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Roman Aleksandrov <raleksandrov@google.com>
Cr-Commit-Position: refs/heads/master@{#841987}

chrome/browser/resources/chromeos/login/components/oobe_adaptive_dialog/oobe_adaptive_dialog_old.html

@@ -21,27 +21,13 @@
         no-lazy$="[[noLazy]]" no-header$="[[noHeader]]"
         no-footer-padding$="[[noFooterPadding]]"
         footer-shrinkable$="[[footerShrinkable]]">
-      <div slot="oobe-icon">
-        <slot name="icon"></slot>
-      </div>
-      <div slot="title">
-        <slot name="title"></slot>
-      </div>
-      <div slot="progress">
-        <slot name="progress"></slot>
-      </div>
-      <div slot="subtitle">
-        <slot name="subtitle"></slot>
-      </div>
-      <div slot="footer">
-        <slot name="content"></slot>
-      </div>
-      <div slot="back-navigation">
-        <slot name="back-navigation"></slot>
-      </div>
-      <div slot="bottom-buttons">
-        <slot name="bottom-buttons"></slot>
-      </div>
+      <slot slot="oobe-icon" name="icon"></slot>
+      <slot slot="title" name="title"></slot>
+      <slot slot="subtitle" name="subtitle"></slot>
+      <slot slot="progress" name="progress"></slot>
+      <slot slot="footer" name="content"></slot>
+      <slot slot="back-navigation" name="back-navigation"></slot>
+      <slot slot="bottom-buttons" name="bottom-buttons"></slot>
     </oobe-dialog>
   </template>
   <script src="oobe_adaptive_dialog.js"></script>