Gender-neutralize a few more comments / strings.

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <!-- Idle logout dialog for retail mode -->
   <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog. Used in retail mode only.">
     Are you still there?
   </message>
@@ skipping 1673 matching lines @@
   </message>
   <message name="IDS_LOGIN_FATAL_ERROR_PASSWORD_VERIFICATION" desc="Message to show when the authentication could not be completed because two attempts to verify the user's password failed.">
     Sign-in failed because your password could not be verified. Please contact your administrator or try again.
   </message>
   <message name="IDS_LOGIN_FATAL_ERROR_TEXT_INSECURE_URL" desc="Message to show when the authentication could not be completed because a redirect to an insecure URL was detected and blocked.">
     Sign-in failed because it was configured to use a non-secure URL (<ph name="BLOCKED_URL">$1<ex>http://www.example.com/login.html</ex></ph>). Please contact your administrator.
   </message>
   <message name="IDS_LOGIN_FATAL_ERROR_TRY_AGAIN_BUTTON" desc="Label for a button which starts sign-in from the beginning after fatal error.">
     Try again
   </message>
-  <message name="IDS_LOGIN_SAML_INTERSTITIAL_MESSAGE" desc="Message to show on the SAML interstitial page to tell the user to continue signing in using his enterprise account.">
+  <message name="IDS_LOGIN_SAML_INTERSTITIAL_MESSAGE" desc="Message to show on the SAML interstitial page to tell the user to continue signing in using their enterprise account.">
     This device is managed by <ph name="BEGIN_BOLD">&lt;strong&gt;</ph><ph name="DOMAIN">$1<ex>acmecorp.com</ex></ph><ph name="END_BOLD">&lt;/strong&gt;</ph>.
     <ph name="LINE_BREAK">&lt;br/&gt;</ph>
     Please click "Next" to continue signing in to your <ph name="BEGIN_BOLD">&lt;strong&gt;</ph><ph name="DOMAIN">$1<ex>acmecorp.com</ex></ph><ph name="END_BOLD">&lt;/strong&gt;</ph> account.
   </message>
   <message name="IDS_LOGIN_SAML_INTERSTITIAL_CHANGE_ACCOUNT_LINK_TEXT" desc="Text of the link that allows the user to change the login account.">
     Sign in with a different account
   </message>
   <message name="IDS_LOGIN_SAML_INTERSTITIAL_NEXT_BUTTON_TEXT" desc="Text shown on the Next button.">
     Next
   </message>
@@ skipping 896 matching lines @@
   </message>
   <message name="IDS_OPTIONS_WALLPAPER_STRETCH_LAYOUT" desc="Label for option to stretch a customized wallpaper.">
     Stretch
   </message>
   <message name="IDS_OPTIONS_CHANGE_PICTURE" desc="In the settings tab, the text on the button to change picture for the current user." meaning="Hint text">
     Change...
   </message>
   <message name="IDS_OPTIONS_CHANGE_PICTURE_CAPTION" desc="Caption on the user picture that user must click to change it, must be short.">
     Change
   </message>
-  <message name="IDS_OPTIONS_CHANGE_PICTURE_DIALOG_TITLE" desc="Title of the dialog shown when user wants to change his/her picture.">
+  <message name="IDS_OPTIONS_CHANGE_PICTURE_DIALOG_TITLE" desc="Title of the dialog shown when user wants to change their picture.">
     Change picture
   </message>
   <message name="IDS_OPTIONS_CHANGE_PICTURE_DIALOG_TEXT" desc="Text with description of what to do on Change picture dialog.">
     Choose a picture to display for your account on the sign-in screen.
   </message>
   <message name="IDS_OPTIONS_CHANGE_PICTURE_CHOOSE_FILE" desc="Text on a button that shows file dialog to choose a picture from file.">
     Choose a file
   </message>
-  <message name="IDS_OPTIONS_CROP_IMAGE_DIALOG_TITLE" desc="Title of the dialog shown when user wants to crop his/her picture.">
+  <message name="IDS_OPTIONS_CROP_IMAGE_DIALOG_TITLE" desc="Title of the dialog shown when user wants to crop their picture.">
     Crop image
   </message>
   <message name="IDS_OPTIONS_CROP_IMAGE_DIALOG_TEXT" desc="Text with description of what to do on Crop image dialog.">
     Select a square region of the image.
   </message>
   <message name="IDS_OPTIONS_CHANGE_PICTURE_TAKE_PHOTO" desc="The text on the button to take photo of the current user.">
     Take photo
   </message>
   <message name="IDS_OPTIONS_CHANGE_PICTURE_PHOTO_FROM_CAMERA" desc="The accessible text on the icon in the user image grid for a camera photo, when a photo has been captured.">
     Photo from internal camera
@@ skipping 4017 matching lines @@
   <message name="IDS_ARC_ANDROID_MANAGEMENT_REQUIRED_ERROR" desc="Error message shown when Android management is required for an unmanaged Chrome OS user.">
     Your organization has not enabled Android Apps for your account. Contact your administrator for more information.
   </message>
   <message name="IDS_FLAGS_ENABLE_IME_MENU_NAME" desc="Name of the about: flag for enabling opt-in IME menu.">
     Enable opt-in IME menu
     </message>
   <message name="IDS_FLAGS_ENABLE_IME_MENU_DESCRIPTION" desc="Description of the about: flag for enabling opt-in IME menu.">
     Enable access to the new IME menu in the Language Settings page.
   </message>
 </grit-part>