[MD settings] .settings-row.wide and reduce use of flex layout

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">
       :host-context([dir=rtl]) button[is='paper-icon-button-light'] {
         transform: scaleX(-1);  /* Flip on the X axis (aka mirror). */
       }
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       .settings-box .start.two-line {
         display: flex;
       }
 
       /* The start (left in LTR) part (horizontally) of a row. */
       .settings-box .start {
         align-items: center;
         flex: auto;
       }
 
+      /* For grouping elements with common flex options. */
       .settings-row {
         align-items: center;
         display: flex;
         flex-direction: row;
         max-width: 100%;
+        min-width: 0;  /* Workaround for text elision in sub-elements. */
+      }
+
+      /* Expand to fill-up available space. */
+      .settings-row.wide {
+        flex: 1;
       }
 
       .no-outline,
       [scrollable] .no-outline {
         background: none;
         outline: none;
       }
 
       /* Helper for a list frame to automatically avoid the separator line. */
       .vertical-list > *:not(:first-of-type) {
@@ skipping 67 matching lines @@
         transform: rotate(-135deg);
       }
 
       .column-header {
         color: var(--paper-grey-600);
         font-weight: 500;
       }
     </style>
   </template>
 </dom-module>