MD Settings: up contast of headers and other things that use grey 500 on white

chrome/browser/resources/settings/printing_page/cups_add_printer_dialog_util.html

 <link rel="import" href="chrome://resources/cr_elements/cr_dialog/cr_dialog.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-dropdown/iron-dropdown.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-input/iron-input.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input-container.html">
 <link rel="import" href="cups_printers_browser_proxy.html">
 <link rel="import" href="../settings_shared_css.html">
@@ skipping 45 matching lines @@
 
 <dom-module id="drop-down-search-box">
   <template>
     <style include="settings-shared cups-add-printer-dialog-style">
       iron-dropdown,
       paper-input-container {
         width: 270px;
       }
 
       paper-input-container {
-        --paper-input-container-color: var(--google-grey-500);
+        --paper-input-container-color: var(--paper-grey-600);
         --paper-input-container-input: {
           font-size: inherit;
         };
       }
 
       iron-dropdown .dropdown-content {
         background-color: white;
         box-shadow: 0 2px 6px var(--paper-grey-500);
         min-width: 128px;
         padding: 8px 0;
@@ skipping 47 matching lines @@
       <div class="body">
         <content select=".dialog-body"></content>
       </div>
       <div class="button-container">
         <content select=".dialog-buttons"></content>
       </div>
     </dialog>
   </template>
   <script src="cups_add_printer_dialog_util.js"></script>
 </dom-module>