[CrOS Settings] Move OS search page strings from settings strings

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

Bug: 967883
Change-Id: Ie04f612f36480376dde981a8d475bb806eb0c44a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2070540Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Cr-Commit-Position: refs/heads/master@{#747023}

chrome/app/os_settings_strings.grdp

@@ -301,6 +301,24 @@
   <message name="IDS_OS_SETTINGS_SEARCH_ENGINE_TOOLTIP" desc="Tooltip in OS settings explaining that search engine is used in both the Chrome browser and the Chrome OS app launcher.">
     Used by Chrome browser and <ph name="DEVICE_TYPE">$1<ex>Chromebook</ex></ph> Launcher
   </message>
+  <message name="IDS_SETTINGS_SEARCH_GOOGLE_ASSISTANT" desc="Label for the Google Assistant button.">
+    Google Assistant
+  </message>
+  <message name="IDS_SETTINGS_SEARCH_GOOGLE_ASSISTANT_ENABLED" desc="Sub label for the Google Assistant button when Assistant is enabled.">
+    Enabled
+  </message>
+  <message name="IDS_SETTINGS_SEARCH_GOOGLE_ASSISTANT_DISABLED" desc="Sub label for the Google Assistant button when Assistant is disabled.">
+    Disabled
+  </message>
+  <message name="IDS_SETTINGS_SEARCH_GOOGLE_ASSISTANT_ON" desc="Row label in Google Assistant settings." meaning="Google Assistant is on.">
+    On
+  </message>
+  <message name="IDS_SETTINGS_SEARCH_GOOGLE_ASSISTANT_OFF" desc="Row label in Google Assistant settings." meaning="Google Assistant is off.">
+    Off
+  </message>
+   <message name="IDS_SETTINGS_SEARCH_AND_ASSISTANT" desc="Name of the settings page which displays search engine and assistant preferences on Chrome OS.">
+    Search and Assistant
+  </message>
 
   <!-- Files Page (OS settings) -->
   <message name="IDS_OS_SETTINGS_FILES" desc="Name of the settings page which displays file preferences.">

chrome/app/settings_strings.grdp

@@ -1765,35 +1765,13 @@
   <message name="IDS_SETTINGS_SEARCH" desc="Name of the settings page which displays search engine preferences.">
     Search engine
   </message>
-  <if expr="chromeos">
-    <message name="IDS_SETTINGS_SEARCH_AND_ASSISTANT" desc="Name of the settings page which displays search engine and assistant preferences on Chrome OS.">
-      Search and Assistant
-    </message>
-  </if>
   <message name="IDS_SETTINGS_SEARCH_EXPLANATION" desc="Explanation for the search engine dropdown setting.">
     Search engine used in the <ph name="BEGIN_LINK">&lt;a target="_blank" href="$1"&gt;</ph>address bar<ph name="END_LINK">&lt;/a&gt;</ph>
   </message>
   <message name="IDS_SETTINGS_SEARCH_MANAGE_SEARCH_ENGINES" desc="Label for the Manage Search Engines button.">
     Manage search engines
   </message>
-<if expr="chromeos">
-  <message name="IDS_SETTINGS_SEARCH_GOOGLE_ASSISTANT" desc="Label for the Google Assistant button.">
-    Google Assistant
-  </message>
-  <message name="IDS_SETTINGS_SEARCH_GOOGLE_ASSISTANT_ENABLED" desc="Sub label for the Google Assistant button when Assistant is enabled.">
-    Enabled
-  </message>
-  <message name="IDS_SETTINGS_SEARCH_GOOGLE_ASSISTANT_DISABLED" desc="Sub label for the Google Assistant button when Assistant is disabled.">
-    Disabled
-  </message>
-  <message name="IDS_SETTINGS_SEARCH_GOOGLE_ASSISTANT_ON" desc="Row label in Google Assistant settings." meaning="Google Assistant is on.">
-    On
-  </message>
-  <message name="IDS_SETTINGS_SEARCH_GOOGLE_ASSISTANT_OFF" desc="Row label in Google Assistant settings." meaning="Google Assistant is off.">
-    Off
-  </message>
-</if>
-
+  
   <!-- Search Engines Page -->
   <message name="IDS_SETTINGS_SEARCH_ENGINES" desc="Name of the settings page which manages search engines.">
     Search Engines