Remove iOS references in shared_style.html.

The HTML file lives inside chrome/, which iOS does not use at all.

Change-Id: I0dfdcf240a8030dd69c8ca4804522e7f3990a87e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1839635
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702925}

chrome/browser/resources/bookmarks/shared_style.html

@@ -61,7 +61,7 @@
         width: 20px;
       }
 
-<if expr="is_macosx or is_ios">
+<if expr="is_macosx">
       @media (prefers-color-scheme: dark) {
         .folder-icon {
            content: url(chrome://theme/IDR_FOLDER_CLOSED_WHITE);
@@ -69,7 +69,7 @@
       }
 </if>
 
-<if expr="not is_macosx and not is_ios">
+<if expr="not is_macosx">
       .folder-icon[open] {
         content: url(chrome://theme/IDR_FOLDER_OPEN);
       }