[MD settings] move policy indicator on homepage url

This CL moves the policy indicator on the homepage url from under the
input to the same line as the input.

Bug: 736149
Change-Id: I3896b3e77284a82742ae51ea1d6fe86753087488
Reviewed-on: https://chromium-review.googlesource.com/570821Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486960}

chrome/browser/resources/settings/appearance_page/home_url_input.html

@@ -12,10 +12,11 @@
     <style>
       :host {
         cursor: auto;
-        display: inline-block;
       }
 
       #outerDiv {
+        align-items: center;
+        display: flex;
         justify-content: space-between;
       }
     </style>