Print Preview UI tweaks:

- change "More/Fewer options" -> "More/Fewer settings"
- change "More/Fewer settings" button background color to #f6f6f6

BUG=397741

Review URL: https://codereview.chromium.org/553843003

Cr-Commit-Position: refs/heads/master@{#294316}

chrome/app/generated_resources.grd

@@ -8322,10 +8322,10 @@ Keep your key file in a safe place. You will need it to create new versions of y
           Add a printer
         </message>
         <message name="IDS_MORE_OPTIONS_LABEL" desc="Label of the toggle element to switch between showing more or less printing options in the Print Preview.">
-          More options
+          More settings
         </message>
         <message name="IDS_LESS_OPTIONS_LABEL" desc="Label of the toggle element to switch between showing more or less printing options in the Print Preview.">
-          Fewer options
+          Fewer settings
         </message>
         <message name="IDS_PRINT_PREVIEW_NO_DESTS_PROMO_NOT_NOW_BUTTON_LABEL" desc="Label of button to cancel the Google Cloud Print promotion.">
           Not now

chrome/browser/resources/print_preview/settings/more_settings.css

@@ -3,7 +3,7 @@
  * found in the LICENSE file. */
 
 #more-settings {
-  background-color: #fafafa;
+  background-color: #f6f6f6;
   border-bottom: 1px solid #e1e1e1;
   border-top: 1px solid #e1e1e1;
   margin-top: 4px;