[MD settings] change height and width of checkboxes

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">
       h2 {
         align-items: center;
         display: flex;
@@ skipping 250 matching lines @@
         border-top: none;
       }
 
       .settings-box.block {
         display: block;
       }
 
       /* A row with two lines of text. Often the lower line will be .secondary.
        */
       .settings-box.two-line {
-        min-height: 56px;
+        min-height: var(--settings-row-two-line-min-height);
       }
 
       /*
        * A settings box with a single start-aligned column, generally but not
        * necessarily used in combination with two-line.
        */
       .settings-box.single-column {
         align-items: flex-start;
         flex-direction: column;
         justify-content: center;
@@ skipping 87 matching lines @@
         top: 10px;
         width: 10px;
       }
 
       .search-highlight-hit {
         background-color: var(--paper-yellow-500);
       }
     </style>
   </template>
 </dom-module>