Implement progress bar spec (determinate and indeterminate).

ui/app_list/resources/app_list_resources.grd

Index: ui/app_list/resources/app_list_resources.grd
diff --git a/ui/app_list/resources/app_list_resources.grd b/ui/app_list/resources/app_list_resources.grd
index b2a76bb9e65084bb2d11a253a23ad00406f4fed0..de142997cdfdbee9e71e55dcf8a3879c3b0626df 100644
--- a/ui/app_list/resources/app_list_resources.grd
+++ b/ui/app_list/resources/app_list_resources.grd
@@ -15,10 +15,6 @@
       <!-- KEEP THESE IN ALPHABETICAL ORDER!  DO NOT ADD TO RANDOM PLACES JUST
            BECAUSE YOUR RESOURCES ARE FUNCTIONALLY RELATED OR FALL UNDER THE
            SAME CONDITIONALS. -->
-      <structure type="chrome_scaled_image" name="IDR_APP_LIST_ITEM_PROGRESS_BACKGROUND" file="common/app_list_progress_bar_background.png" />
-      <structure type="chrome_scaled_image" name="IDR_APP_LIST_ITEM_PROGRESS_LEFT" file="common/app_list_progress_bar_left.png" />
-      <structure type="chrome_scaled_image" name="IDR_APP_LIST_ITEM_PROGRESS_CENTER" file="common/app_list_progress_bar_center.png" />
-      <structure type="chrome_scaled_image" name="IDR_APP_LIST_ITEM_PROGRESS_RIGHT" file="common/app_list_progress_bar_right.png" />
       <structure type="chrome_scaled_image" name="IDR_APP_LIST_TOOLS_HOVER" file="common/app_list_tools_hover.png" />
       <structure type="chrome_scaled_image" name="IDR_APP_LIST_TOOLS_NORMAL" file="common/app_list_tools_normal.png" />
       <structure type="chrome_scaled_image" name="IDR_APP_LIST_TOOLS_PRESSED" file="common/app_list_tools_pressed.png" />