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

ui/webui/resources/webui_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This comment is only here because changes to resources are not picked up
 without changes to the corresponding grd file. -->
 <grit latest_public_release="0" current_release="1">
   <outputs>
     <output filename="grit/webui_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="grit/webui_resources_map.cc"
             type="resource_file_map_source" />
@@ skipping 195 matching lines @@
       <structure name="IDR_WEBUI_CSS_BUBBLE_BUTTON"
                  file="css/bubble_button.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_BUTTER_BAR"
                  file="css/butter_bar.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_CHROME"
                  file="css/chrome_shared.css" type="chrome_html"
                  flattenhtml="true" />
       <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"
                  file="css/i18n_process.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_LIST"
                  file="css/list.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_MENU"
                  file="css/menu.css" type="chrome_html"
                  flattenhtml="true" />
       <structure name="IDR_WEBUI_CSS_MENU_BUTTON"
@@ skipping 56 matching lines @@
       <structure name="IDR_WEBUI_HTML_CR_UI_MENU"
                  file="html/cr/ui/menu.html" type="chrome_html" />
       <structure name="IDR_WEBUI_HTML_CR_UI_MENU_BUTTON"
                  file="html/cr/ui/menu_button.html" type="chrome_html" />
       <structure name="IDR_WEBUI_HTML_CR_UI_MENU_ITEM"
                  file="html/cr/ui/menu_item.html" type="chrome_html" />
       <structure name="IDR_WEBUI_HTML_CR_UI_OVERLAY"
                  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"
                  file="html/i18n_template.html" type="chrome_html" />
       <structure name="IDR_WEBUI_HTML_LOAD_TIME_DATA"
                  file="html/load_time_data.html" type="chrome_html" />
       <structure name="IDR_WEBUI_HTML_POLYMER_CONFIG"
                  file="html/polymer_config.html" type="chrome_html" />
       <structure name="IDR_WEBUI_HTML_UTIL"
                  file="html/util.html" type="chrome_html" />
@@ skipping 70 matching lines @@
                  file="js/cr/ui/node_utils.js" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_CR_UI_OVERLAY"
                  file="js/cr/ui/overlay.js" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_CR_UI_PAGE_MANAGER_PAGE"
                  file="js/cr/ui/page_manager/page.js" type="chrome_html"
                  flattenhtml="true" />
       <structure name="IDR_WEBUI_JS_CR_UI_PAGE_MANAGER_PAGE_MANAGER"
                  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"
                  file="js/cr/ui/grid.js" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_CR_UI_REPEATING_BUTTON"
                  file="js/cr/ui/repeating_button.js"
                  type="chrome_html" />
       <structure name="IDR_WEBUI_JS_CR_UI_TABLE"
                  file="js/cr/ui/table.js" type="chrome_html" />
       <structure name="IDR_WEBUI_JS_CR_UI_TABLE_COLUMN"
@@ skipping 40 matching lines @@
                    type="chrome_html" />
         <structure name="IDR_WEBUI_JS_UI_ACCOUNT_TWEAKS"
                    file="js/chromeos/ui_account_tweaks.js"
                    type="chrome_html" />
       </if>
       <part file="cr_elements_resources.grdp" />
       <part file="polymer_resources.grdp" />
     </structures>
   </release>
 </grit>