Revert of [Contextual Search] Remove opt-in code.

chrome/browser/browser_resources.grd

Index: chrome/browser/browser_resources.grd
diff --git a/chrome/browser/browser_resources.grd b/chrome/browser/browser_resources.grd
index 63b4689272f8d069529c99d075eeea3621b84f33..e275dcae824fd13fec78937fbf16ce3129984eff 100644
--- a/chrome/browser/browser_resources.grd
+++ b/chrome/browser/browser_resources.grd
@@ -23,6 +23,10 @@
         <structure name="IDR_APP_LIST_START_PAGE_CSS" file="resources\app_list\start_page.css" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_APP_LIST_START_PAGE_HTML" file="resources\app_list\start_page.html" flattenhtml="true" type="chrome_html" />
         <structure name="IDR_APP_LIST_START_PAGE_JS" file="resources\app_list\start_page.js" flattenhtml="true" type="chrome_html" />
+      </if>
+      <if expr="is_android">
+        <structure name="IDR_CONTEXTUAL_SEARCH_PROMO_CSS" file="resources\contextual_search\promo.css" flattenhtml="true" type="chrome_html" />
+        <structure name="IDR_CONTEXTUAL_SEARCH_PROMO_HTML" file="resources\contextual_search\promo.html" flattenhtml="true" type="chrome_html" />
       </if>
       <if expr="not is_android">
         <structure name="IDR_DOWNLOADS_CSS" file="resources\downloads\downloads.css" flattenhtml="true" type="chrome_html" />
@@ -105,6 +109,10 @@
       </if>
       <if expr="enable_app_list">
         <include name="IDR_CHROME_APP_MANIFEST" file="resources\chrome_app\manifest.json" type="BINDATA" />
+      </if>
+      <if expr="is_android">
+        <include name="IDR_CONTEXTUAL_SEARCH_PROMO_JS" file="resources\contextual_search\promo.js" flattenhtml="true" type="BINDATA" />
+        <include name="IDR_CONTEXTUAL_SEARCH_PROMO_HEADER_SVG" file="resources\contextual_search\header.svg" type="BINDATA" />
       </if>
       <if expr="not is_android and not is_ios">
         <include name="IDR_COPRESENCE_CSS" file="resources\copresence.css" type="BINDATA" />