MD Settings: About page, force line breaks in "Command line" string.

chrome/browser/resources/settings/about_page/detailed_build_info.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="/about_page/about_page_browser_proxy.html">
 <link rel="import" href="/about_page/channel_switcher_dialog.html">
 <link rel="import" href="/i18n_setup.html"
 <link rel="import" href="/settings_shared_css.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icon/iron-icon.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 
 <dom-module id="settings-detailed-build-info">
   <template>
     <style include="settings-shared">
       .secondary {
         -webkit-user-select: text;
       }
+
+      /* The command line string can contain very long substrings that
+       * don't have any spaces, need to force a line break in such cases. */
+      #command-line {
+        overflow-wrap: break-word;
+        width: 100%;
+      }
     </style>
     <div class="settings-box two-line single-column">
       <div>$i18n{aboutPlatformLabel}</div>
       <div class="secondary" id="osVersion">[[versionInfo_.osVersion]]</div>
     </div>
     <div class="settings-box two-line single-column"
         hidden$="[[!shouldShowVersion_(versionInfo_.osFirmware)]]">
       <div>$i18n{aboutFirmwareLabel}</div>
       <div class="secondary" id="osFirmware">[[versionInfo_.osFirmware]]</div>
     </div>
@@ skipping 25 matching lines @@
     <div class="settings-box two-line single-column">
       <div>V8</div>
       <div class="secondary">$i18n{aboutJsEngineVersion}</div>
     </div>
     <div class="settings-box two-line single-column">
       <div>$i18n{aboutUserAgentLabel}</div>
       <div class="secondary">$i18n{aboutUserAgent}</div>
     </div>
     <div class="settings-box two-line single-column">
       <div>$i18n{aboutCommandLineLabel}</div>
-      <div class="secondary">$i18n{aboutCommandLine}</div>
+      <div id="command-line" class="secondary">$i18n{aboutCommandLine}</div>
     </div>
     <div class="settings-box two-line single-column">
       <div>$i18n{aboutBuildDateLabel}</div>
       <div class="secondary">$i18n{aboutBuildDate}</div>
     </div>
   </template>
   <script src="detailed_build_info.js"></script>
 </dom-module>