MD Settings: cr-slider: Make display consistent and clean up.

chrome/browser/resources/settings/settings_shared_css.html

 <link rel="import" href="chrome://resources/cr_elements/shared_style_css.html">
 <link rel="import" href="/settings_vars_css.html">
 
 <!-- Common styles for Material Design settings. -->
 <dom-module id="settings-shared">
   <template>
     <style include="cr-shared-style">
       /* Included here so we don't have to include "iron-positioning" in every
        * stylesheet. See crbug.com/498405. */
       [hidden] {
@@ skipping 321 matching lines @@
         border-top: var(--settings-separator-line);
       }
 
       .settings-checkbox-spacer {
         -webkit-margin-start: calc(
             var(--checkbox-margin-start) +
             var(--checkbox-size) +
             var(--checkbox-spacing));
       }
 
-      /* Keep the slider color consistent throughout the range. */
-      cr-slider.always-on {
-        --paper-slider-knob-start-border-color: var(--google-blue-700);
-        --paper-slider-knob-start-color: var(--google-blue-700);
-        --paper-slider-pin-start-color: var(--google-blue-700);
-      }
-
       .favicon-image {
         background-repeat: no-repeat;
         background-size: contain;
         height: 16px;
         width: 16px;
       }
 
       .search-bubble {
         position: absolute;
         z-index: 1;
@@ skipping 24 matching lines @@
       /* Turns the arrow direction downwards, when the bubble is placed above
        * the anchor element */
       .search-bubble-innards.above::after {
         -webkit-transform: rotate(-135deg);
         bottom: -5px;
         top: auto;
       }
     </style>
   </template>
 </dom-module>