Remove unused asset (incognito.png)

chrome/app/theme/theme_resources.grd

Index: chrome/app/theme/theme_resources.grd
diff --git a/chrome/app/theme/theme_resources.grd b/chrome/app/theme/theme_resources.grd
index 7535dfb9b5d732cb0080a01f14b85099b7671c72..1bc856021f666412fef4f41a32a4357ff8eb15b6 100644
--- a/chrome/app/theme/theme_resources.grd
+++ b/chrome/app/theme/theme_resources.grd
@@ -199,10 +199,6 @@
       </if>
       <structure type="chrome_scaled_image" name="IDR_HELP_MENU" file="common/help_16.png" />
       <structure type="chrome_scaled_image" name="IDR_HOTWORD_NOTIFICATION_ICON" file="common/notification_hotword_icon.png" />
-      <if expr="not is_android and not is_ios">
-        <!-- TODO(estade): replace with vector image when one's available. -->
-        <structure type="chrome_scaled_image" name="IDR_ICON_PROFILES_MENU_INCOGNITO" file="common/incognito.png" />
-      </if>
       <if expr="is_macosx">
         <structure type="chrome_scaled_image" name="IDR_ICON_PROFILES_ACCOUNT_BUTTON_ERROR" file="legacy/avatar_menu_auth_error.png" />
         <structure type="chrome_scaled_image" name="IDR_ICON_PROFILES_EDIT_CAMERA" file="legacy/edit_camera.png" />