[MD Extensions] Move search field out of downloads, use it in extensions

ui/webui/resources/webui_resources.grd

Index: ui/webui/resources/webui_resources.grd
diff --git a/ui/webui/resources/webui_resources.grd b/ui/webui/resources/webui_resources.grd
index 8a84b14799dd8f79d53f7f388366acbc9d389276..2d6d28fce338e950a561d0e18de0ffcd9b9f568c 100644
--- a/ui/webui/resources/webui_resources.grd
+++ b/ui/webui/resources/webui_resources.grd
@@ -213,6 +213,9 @@ without changes to the corresponding grd file. -->
       <structure name="IDR_WEBUI_CSS_CONTROLLED_INDICATOR"
                  file="css/controlled_indicator.css" type="chrome_html"
                  flattenhtml="true" />
+      <structure name="IDR_WEBUI_CSS_CR_UI_SEARCH_FIELD"
+                 file="css/cr/ui/search_field.css" type="chrome_html"
+                 flattenhtml="true" />
       <structure name="IDR_WEBUI_CSS_DIALOGS"
                  file="css/dialogs.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_I18N_PROCESS"
@@ -289,6 +292,8 @@ without changes to the corresponding grd file. -->
                  file="html/cr/ui/overlay.html" type="chrome_html" />
       <structure name="IDR_WEBUI_HTML_CR_UI_POSITION_UTIL"
                  file="html/cr/ui/position_util.html" type="chrome_html" />
+      <structure name="IDR_WEBUI_HTML_CR_UI_SEARCH_FIELD"
+                 file="html/cr/ui/search_field.html" type="chrome_html" />
       <structure name="IDR_WEBUI_HTML_EVENT_TRACKER"
                  file="html/event_tracker.html" type="chrome_html" />
       <structure name="IDR_WEBUI_HTML_I18N_TEMPLATE"
@@ -379,6 +384,8 @@ without changes to the corresponding grd file. -->
                  file="js/cr/ui/page_manager/page_manager.js" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_CR_UI_POSITION_UTIL"
                  file="js/cr/ui/position_util.js" type="chrome_html" />
+      <structure name="IDR_WEBUI_JS_CR_UI_SEARCH_FIELD"
+                 file="js/cr/ui/search_field.js" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_CR_UI_SPLITTER"
                  file="js/cr/ui/splitter.js" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_CR_UI_GRID"