[MD settings] move the subpage search underline up

chrome/browser/resources/settings/settings_page/settings_subpage_search.html

Index: chrome/browser/resources/settings/settings_page/settings_subpage_search.html
diff --git a/chrome/browser/resources/settings/settings_page/settings_subpage_search.html b/chrome/browser/resources/settings/settings_page/settings_subpage_search.html
index 906683a104fa6a49fdbfa1a9dd9c91752601daf1..fceecab568b8adf6811e81ce49ffc469c7f21cc5 100644
--- a/chrome/browser/resources/settings/settings_page/settings_subpage_search.html
+++ b/chrome/browser/resources/settings/settings_page/settings_subpage_search.html
@@ -9,6 +9,18 @@
   <template>
     <style>
       :host {
+        --subpage-search-underline: {

[stevenjb, 2016/09/08 16:36:06]

nit: Would it be more clear if we named these something something like
--paper-input-container-underline--search so that it could be in the same :host
block? I don't really have a strong opinion, just a thought.

[dschuyler, 2016/09/08 16:57:44]

I wondered about something similar. My reasoning is that
it's more clear to 'know' that --paper-* refers to polymer
paper elements.

I'm wondering about excluding --foo- vars from the 
alphabetical requirement. I'll start a doc or separate thread
about it.

+          margin-bottom: -2px;
+          margin-top: -2px;
+        }
+      }
+
+      :host {
+        --paper-input-container-underline: var(--subpage-search-underline);
+        --paper-input-container-underline-focus:
+            var(--subpage-search-underline);
+        --paper-input-container-underline-disabled:
+            var(--subpage-search-underline);
         --paper-input-suffix: {
           /* Required to align the icon in |clearSearch| vertically. */
           line-height: 0;