Remove WebKit version from the About page on Chrome OS and the Blink version from chrome://version.

chrome/browser/resources/help/help_content.html

  <div class="content-area">
   <div id="about-container">
     <img id="product-logo" srcset="chrome://theme/current-channel-logo@1x 1x,
                                    chrome://theme/current-channel-logo@2x 2x"
         alt="">
     <div id="product-description">
       <h2 i18n-content="aboutProductTitle"></h2>
       <span i18n-content="aboutProductDescription"></span>
     </div>
   </div>
@@ skipping 78 matching lines @@
               hidden></span>
         </div>
         <button id="change-channel"
             i18n-content="channelChangeButton" disabled>
         </button>
         <div id="channel-change-disallowed-icon"
             class="help-page-icon" hidden>
         </div>
       </section>
       <section>
-        <h3 i18n-content="webkit"></h3>
-        <div i18n-content="webkitVersion" dir="ltr"></div>
-      </section>
-      <section>
         <h3 i18n-content="jsEngine" dir="ltr"></h3>
         <div i18n-content="jsEngineVersion"></div>
       </section>
       <section>
         <h3 i18n-content="userAgent"></h3>
         <div i18n-content="userAgentInfo" dir="ltr"></div>
       </section>
       <section>
         <h3 i18n-content="commandLine"></h3>
         <div i18n-content="commandLineInfo" dir="ltr"></div>
@@ skipping 16 matching lines @@
 <if expr="_google_chrome">
     <div id="product-tos"></div>
 </if>
   </div>
 <if expr="chromeos">
   <div id="regulatory-label-container" hidden>
     <img id="regulatory-label">
   </div>
 </if>
 </div>