Add more background js file and remove Google Analytics setup.

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>
   <message name="IDS_CHROMEBOOK" desc="The localized name for Chromebook.">
     Chromebook
   </message>
   <message name="IDS_CHROMEBOX" desc="The localized name for Chromebox">
@@ skipping 1035 matching lines @@
   </message>
   <message name="IDS_IMAGEBURN_CANCEL_BUTTON" desc="Text on the button that cancels download">
     Cancel
   </message>
   <message name="IDS_IMAGEBURN_RETRY_BUTTON" desc="Text on the button that triggers burn restart">
     Try again
   </message>
 
   <!-- Chrome OS Strings -->
   <message name="IDS_ECHO_CONSENT_DIALOG_TEXT" desc="Dialog text shown when user is asked to give consent to proceed with redeeming ECHO offer.">
-    <ph name="SERVICE_NAME">$1<ex>Google Drive</ex></ph> wants to verify that you are using an eligible Chrome OS device. <ph name="MORE_INFO_LINK">$2<ex>More info</ex></ph>
+    <ph name="SERVICE_NAME">$1<ex>Google Drive</ex></ph> wants to check if your Chrome OS device is eligible for an offer. <ph name="MORE_INFO_LINK">$2<ex>More info</ex></ph>
   </message>
   <message name="IDS_ECHO_DISABLED_CONSENT_DIALOG_TEXT" desc="Dialog text shown when user is informed that redeeming offers is disabled for the device.">
     Your IT administrator has disabled Chrome Goodies for your device. <ph name="MORE_INFO_LINK">$1<ex>More info</ex></ph>
   </message>
   <message name="IDS_ECHO_CONSENT_DISMISS_BUTTON" desc="Dismiss dialog button label for disabled echo dialog.">
     Dismiss
   </message>
   <message name="IDS_FLAGS_DISABLE_QUICKOFFICE_COMPONENT_APP_NAME" desc="Name for the flag to disable Chrome Office Viewer component extension.">
     Disable Quickoffice component extension
   </message>
@@ skipping 4367 matching lines @@
   <message name="IDS_SET_TIME_BUTTON_CLOSE" desc="Text for the button to close the window.">
     Done
   </message>
   <message name="IDS_SET_TIME_DATE_LABEL" desc="Label for the date input element.">
     System date
   </message>
   <message name="IDS_SET_TIME_TIME_LABEL" desc="Label for the time input element.">
     System time
   </message>
 </grit-part>