[MD settings] remove tertiary-button css

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 43 matching lines @@
         @apply(--settings-actionable);
         height: var(--settings-row-min-height);
         width: 31px;
       }
 
       span ~ a {
         -webkit-margin-start: 4px;
       }
 
       .primary-button,
-      .tertiary-button,
       a[href] {
         color: var(--google-blue-700);
       }
 
-      .primary-button,
-      .tertiary-button {
+      .primary-button {
         --paper-button-flat-keyboard-focus: {
           background: rgba(51, 103, 214, .12);  /* --google-blue-700 */
         };
       }
 
       a[href] {
         text-decoration: none;
       }
 
-      /* There are three main button styles, .primary-button, .secondary-button,
-       * and .tertiary-button. The primary is the action button (e.g. "edit",
+      /* There are three main button styles, .primary-button and
+       * .secondary-button. The primary is the action button (e.g. "edit",
        * "delete") while the secondary is often a "Cancel" button. A tertiary
        * button may be used to get more information or similar, that we expect
        * most users will not need. */
       .primary-button {
         --paper-button: {
           font-weight: 500;
           text-align: start;
         };
       }
 
@@ skipping 12 matching lines @@
           color: var(--paper-grey-600);
           font-weight: 500;
           min-width: 1em;  /* A tighter fit than 5.14em for short buttons. */
           text-decoration: none;
         };
         --paper-button-flat-keyboard-focus: {
           background: rgba(0, 0, 0, .12);
         };
       }
 
-      /* See notes in .primary-button. */
-      .tertiary-button {
-        --paper-button: {
-          font-weight: 400;
-          text-decoration: none;
-        };
-      }
-
       .settings-box .primary-button,
       .settings-box .secondary-button,
       .settings-box .secondary-button {
         -webkit-margin-end: -12px;
         -webkit-margin-start: -12px;
         -webkit-padding-end: 12px;
         -webkit-padding-start: 12px;
       }
 
       paper-checkbox {
@@ skipping 269 matching lines @@
         transform: rotate(-135deg);
       }
 
       .column-header {
         color: var(--paper-grey-600);
         font-weight: 500;
       }
     </style>
   </template>
 </dom-module>