[CrOS settings] Move OS Smart Lock strings from settings strings

This CL moves chromeOS strings for settings Smart Lock page strings
from settings_strings.grdp to os_settings_strings.grdp. It continues
the process of moving all chromeOS specific strings.

Bug: 967883
Change-Id: Ie18ee072f0684409aa888053054aed49e81fb64f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067637
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746493}

chrome/app/os_settings_strings.grdp

@@ -2201,5 +2201,16 @@
   <message name="IDS_SETTINGS_DISPLAY_TOUCH_CALIBRATION_TEXT" desc="In Device Settings > Displays, the sublabel for initiating touch calibration.">
     Set up and adjust the accuracy of your touchscreen
   </message>
+  
+  <!-- Smart Lock Page (OS settings) -->
+  <message name="IDS_SETTINGS_EASY_UNLOCK_SECTION_TITLE" desc="The title of the Easy Unlock section on the settings page.">
+    Smart Lock
+  </message>
+  <message name="IDS_SETTINGS_EASY_UNLOCK_UNLOCK_DEVICE_ONLY" desc="This option lets the user unlock their Chromebook from their phone if they're logged in. It will unlock their Chromebook but will not sign them in.">
+    Unlock device only
+  </message>
+  <message name="IDS_SETTINGS_EASY_UNLOCK_UNLOCK_DEVICE_AND_ALLOW_SIGNIN" desc="This option lets the user unlock their Chromebook from their phone as well as log into their Chromebook without a password if their phone is nearby and unlocked.">
+    Unlock device and sign in to Google Account
+  </message>
 </if>
 </grit-part>
\ No newline at end of file

chrome/app/settings_strings.grdp

@@ -847,12 +847,6 @@
 
   <!-- Easy Unlock Page -->
   <if expr="chromeos">
-    <message name="IDS_SETTINGS_EASY_UNLOCK_SECTION_TITLE" desc="The title of the Easy Unlock section on the settings page.">
-      Smart Lock
-    </message>
-    <message name="IDS_SETTINGS_EASY_UNLOCK_SETUP_INTRO" desc="The text to show in Easy Unlock section to introduce the feature.">
-      Unlock your <ph name="DEVICE_TYPE">$1<ex>Chromebook</ex></ph> with your Android phone.
-    </message>
     <message name="IDS_SETTINGS_EASY_UNLOCK_SETUP" desc="The label of the button to set up Easy Unlock section on the settings page.">
       Set up
     </message>
@@ -901,12 +895,6 @@
     <message name="IDS_SETTINGS_EASY_UNLOCK_OPTIONS" desc="Heading for options for the Smart Lock feature.">
       Smart Lock options
     </message>
-    <message name="IDS_SETTINGS_EASY_UNLOCK_UNLOCK_DEVICE_ONLY" desc="This option lets the user unlock their Chromebook from their phone if they're logged in. It will unlock their Chromebook but will not sign them in.">
-      Unlock device only
-    </message>
-    <message name="IDS_SETTINGS_EASY_UNLOCK_UNLOCK_DEVICE_AND_ALLOW_SIGNIN" desc="This option lets the user unlock their Chromebook from their phone as well as log into their Chromebook without a password if their phone is nearby and unlocked.">
-      Unlock device and sign in to Google Account
-    </message>
   </if>
 
   <!-- Strings specific to the Settings Internet Page -->