Gender-neutralize a few more comments / strings.

chrome/browser/resources/chromeos/login/saml_interstitial.html

 <link rel="import" href="chrome://resources/polymer/v1_0/polymer/polymer.html">
 
 <!--
 UI for the SAML interstitial page.
 Example:
   <saml-interstitial></saml-interstitial>
 
 Attributes:
   'domain' - The enterprise domain the device is enrolled to.
   'showDomainMessages' - If true, the messages showing the enrollment domain
                          will be shown. Its value is set automatically when
                          'domain' is set, and is true as long as 'domain' is
                          not empty.
   'changeAccountLink' - A reference to the change account link so that it can be
                         used in testing.
 
 Functions:
   'submit' - Submits the saml interstitial form for tests. Equivalent to the
              user clicking next.
 
 Events:
   'samlPageNextClicked' - Fired when the "Next" button is clicked indicating
                           that the user would like to proceed with
-                          authentication via his enrollement SAML IdP.
+                          authentication via their enrollement SAML IdP.
   'samlPageChangeAccountClicked' - Fired when the user clicks the sign in with
                                    a differnt account link. GAIA Minute Maid
                                    screen will be shown.
 -->
 <dom-module name="saml-interstitial">
 
 <template>
   <style>
     :host {
       display: block;
@@ skipping 25 matching lines @@
       </gaia-input-form>
 
       <img id="logo-img" src="chrome://theme/IDR_LOGO_GOOGLE_COLOR_90"
            class="self-center" alt="">
     </div>
   </gaia-card>
 
 </template>
 
 </dom-module>