Change the subpage search text color to --paper-gray-800.

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 b4a49b4270b7e06cd23bdc8ca7e271ed3bda78c4..a7fb3ad92cd2865c8faa494464c215f501188a16 100644
--- a/chrome/browser/resources/settings/settings_page/settings_subpage_search.html
+++ b/chrome/browser/resources/settings/settings_page/settings_subpage_search.html
@@ -14,13 +14,18 @@
         -webkit-appearance: none;
       }
 
-      #prompt,
-      #searchInput {
+      #prompt {
         color: var(--google-grey-500);
         font-size: 13px;
         line-height: 36px;
       }
 
+      #searchInput {
+        color: var(--paper-grey-800);
+        font-size: 13px;

[dschuyler, 2016/08/23 02:17:26]

This can be done in this CL or a separate CL: the font-size should be 
expressed as a percentage of the inherited font size. 

E.g.
https://cs.chromium.org/chromium/src/chrome/browser/resources/settings/settin...

[hcarmona, 2016/08/23 20:52:29]

Sounds good, I'll create a followup CL for this.

+        line-height: 36px;
+      }

[dschuyler, 2016/08/23 02:17:26]

Let's make a #prompt with just a color, a #searchInput with just a color, and
then a third block for 
#prompt,
#searchInput {
 with the font-size/height
}

[hcarmona, 2016/08/23 20:52:29]

Done.

+
       #clearSearch {
         -webkit-margin-end: -8px;
         -webkit-margin-start: 8px;