Remove unused assets, update old assets

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 70 matching lines @@
                file="../../views/resources/default_100_percent/common/checkbox_focused_checked_pressed.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_APPS_CHECKBOX_CHECKED_INACTIVE"
                file="../../views/resources/default_100_percent/common/checkbox_checked_inactive.png" type="BINDATA" />
       <!-- Misc buttons -->
       <include name="IDR_WEBUI_IMAGES_APPS_TOPBAR_BUTTON_CLOSE"
                file="images/apps/topbar_button_close.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_APPS_TOPBAR_BUTTON_MAXIMIZE"
                file="images/apps/topbar_button_maximize.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_APPS_TOPBAR_BUTTON_MINIMIZE"
                file="images/apps/topbar_button_minimize.png" type="BINDATA" />
-      <include name="IDR_WEBUI_IMAGES_APPS_TOPBAR_BUTTON_SETTINGS"
-               file="images/apps/topbar_button_settings.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_APPS_BUTTON_BUTTER_BAR_CLOSE"
                file="images/apps/button_butter_bar_close.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_APPS_BUTTON_BUTTER_BAR_CLOSE_HOVER"
                file="images/apps/button_butter_bar_close_hover.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_APPS_BUTTON_BUTTER_BAR_CLOSE_PRESSED"
                file="images/apps/button_butter_bar_close_pressed.png" type="BINDATA" />
 
       <!-- Component apps common image resources - 2x -->
       <!-- White button -->
       <include name="IDR_WEBUI_IMAGES_APPS_BUTTON_2X"
@@ skipping 55 matching lines @@
                file="../../views/resources/default_200_percent/common/checkbox_focused_checked_pressed.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_APPS_CHECKBOX_CHECKED_INACTIVE_2X"
                file="../../views/resources/default_200_percent/common/checkbox_checked_inactive.png" type="BINDATA" />
       <!-- Misc buttons -->
       <include name="IDR_WEBUI_IMAGES_APPS_TOPBAR_BUTTON_2X_CLOSE"
                file="images/2x/apps/topbar_button_close.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_APPS_TOPBAR_BUTTON_2X_MAXIMIZE"
                file="images/2x/apps/topbar_button_maximize.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_APPS_TOPBAR_BUTTON_2X_MINIMIZE"
                file="images/2x/apps/topbar_button_minimize.png" type="BINDATA" />
-      <include name="IDR_WEBUI_IMAGES_APPS_TOPBAR_BUTTON_2X_SETTINGS"
-               file="images/2x/apps/topbar_button_settings.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_APPS_BUTTON_BUTTER_BAR_CLOSE_2X"
                file="images/2x/apps/button_butter_bar_close.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_APPS_BUTTON_BUTTER_BAR_CLOSE_HOVER_2X"
                file="images/2x/apps/button_butter_bar_close_hover.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_APPS_BUTTON_BUTTER_BAR_CLOSE_PRESSED_2X"
                file="images/2x/apps/button_butter_bar_close_pressed.png" type="BINDATA" />
 
       <!-- Non-apps images -->
       <include name="IDR_WEBUI_IMAGES_CHECK"
                file="images/check.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_CHECKBOX_BLACK"
                file="images/checkbox_black.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_CHECKBOX_WHITE"
                file="images/checkbox_white.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_DISABLED_SELECT"
                file="images/disabled_select.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_ERROR"
                file="images/error.svg" type="BINDATA" />
-      <include name="IDR_WEBUI_IMAGES_GEAR"
-               file="images/gear.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_SELECT"
                file="images/select.png" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_THROBBER"
                file="images/throbber.svg" type="BINDATA" />
       <include name="IDR_WEBUI_IMAGES_TRASH"
                file="images/trash.png" type="BINDATA" />
-      <include name="IDR_WEBUI_IMAGES_CLOUDS"
-               file="images/clouds.png" type="BINDATA" />
 
       <part file="cr_elements_images.grdp" />
     </includes>
     <structures>
       <structure name="IDR_WEBUI_CSS_ACTION_LINK"
                  file="css/action_link.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_ALERT_OVERLAY"
                  file="css/alert_overlay.css" type="chrome_html" />
       <structure name="IDR_WEBUI_CSS_APPS_COMMON"
                  file="css/apps/common.css" type="chrome_html" />
@@ skipping 230 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>