cros: Update wallpaper picker shelf icon

According to the discussion in
https://chromium-review.googlesource.com/c/chromium/src/+/938543, the
app icons will be delivered as single 192*192 *.png. Please see the
bug for more details.

Bug: 835350
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I4c20f6e90b200559dc0b347beea15233c675d943
Reviewed-on: https://chromium-review.googlesource.com/1035915Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554893}

chrome/browser/resources/chromeos/wallpaper_manager/manifest.json

@@ -8,13 +8,7 @@
   "manifest_version": 2,
   "description": "An experimental wallpaper picker UI",
   "icons": {
-    "16": "images/icon16.png",
-    "32": "images/icon32.png",
-    "48": "images/icon48.png",
-    "64": "images/icon64.png",
-    "96": "images/icon96.png",
-    "128": "images/icon128.png",
-    "256": "images/icon256.png"
+    "192": "images/icon192.png"
   },
   "permissions": [
     "alarms",

chrome/browser/resources/component_extension_resources.grd

@@ -60,13 +60,7 @@
       <if expr="chromeos">
         <include name="IDR_WALLPAPER_MANAGER_CONSTANTS_JS" file="chromeos/wallpaper_manager/js/constants.js" flattenhtml="true" type="BINDATA" />
         <include name="IDR_WALLPAPER_MANAGER_EVENT_JS" file="chromeos/wallpaper_manager/js/event_page.js" flattenhtml="true" type="BINDATA" />
-        <include name="IDR_WALLPAPER_MANAGER_ICON_16" file="chromeos/wallpaper_manager/images/icon16.png" type="BINDATA" />
-        <include name="IDR_WALLPAPER_MANAGER_ICON_32" file="chromeos/wallpaper_manager/images/icon32.png" type="BINDATA" />
-        <include name="IDR_WALLPAPER_MANAGER_ICON_48" file="chromeos/wallpaper_manager/images/icon48.png" type="BINDATA" />
-        <include name="IDR_WALLPAPER_MANAGER_ICON_64" file="chromeos/wallpaper_manager/images/icon64.png" type="BINDATA" />
-        <include name="IDR_WALLPAPER_MANAGER_ICON_96" file="chromeos/wallpaper_manager/images/icon96.png" type="BINDATA" />
-        <include name="IDR_WALLPAPER_MANAGER_ICON_128" file="chromeos/wallpaper_manager/images/icon128.png" type="BINDATA" />
-        <include name="IDR_WALLPAPER_MANAGER_ICON_256" file="chromeos/wallpaper_manager/images/icon256.png" type="BINDATA" />
+        <include name="IDR_WALLPAPER_MANAGER_ICON_192" file="chromeos/wallpaper_manager/images/icon192.png" type="BINDATA" />
         <include name="IDR_WALLPAPER_MANAGER_MAIN_JS" file="chromeos/wallpaper_manager/js/main_scripts.js" flattenhtml="true" type="BINDATA" />
         <include name="IDR_WALLPAPER_MANAGER_UTIL_JS" file="chromeos/wallpaper_manager/js/util.js" flattenhtml="true" type="BINDATA" />
         <include name="IDR_FIRST_RUN_DIALOG_BACKGROUND_JS" file="chromeos/first_run/app/background.js" flattenhtml="true" type="BINDATA" />