ntp4: respect non-default apps promo logo

chrome/browser/resources/ntp4/apps_page.css

 /* Copyright (c) 2011 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 .app {
   position: absolute;
   text-align: center;
   -webkit-transition: -webkit-transform 0.1s;
 }
 
 .app:active,
 .dragging .app,
 .drag-representation .app {
   /* Don't animate the initial scaling.  */
   -webkit-transition-duration: 0;
   -webkit-transform: scale(1.1);
 }
 
 .app-contents > span {
   cursor: pointer;
   display: block;
   overflow: hidden;
   text-decoration: none;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
-.app-contents > img {
+.app-img-container {
   cursor: pointer;
-  display: block;
   margin-left: auto;
   margin-right: auto;
   /* -webkit-mask-image set by JavaScript to the image source */
   -webkit-mask-size: 100% 100%;
 }
 
+.app-img-container > * {
+  height: 100%;
+  width: 100%;
+}
+
 .app-icon-div {
   /* TODO(gbillock): find a better style for this div. Better border color? */
   border: 1px solid gray;
   border-radius: 4px;
   cursor: pointer;
   display: -webkit-box;
   /* 96px is the suggested "filled" icon size for Chrome apps */
   height: 96px;
   margin-bottom: 15px;
   margin-left: auto;
@@ skipping 13 matching lines @@
   z-index: 1000;
 }
 
 /* Promo */
 /* Show the promo if the webstore has a promo and is the only app on the page.
  */
 .tile:only-of-type > .has-promo > .app-contents > span {
   display: none;
 }
 
+.tile:only-of-type > .has-promo .app-img-container > .apps-promo-logo {
+  display: block;
+}
+
+.apps-promo-logo {
+  display: none;
+}
+
+.tile:only-of-type > .has-promo .app-img-container > img:first-child {
+  display: none;
+}
+
+.app-img-container > img:first-child {
+  display: block;
+}
+
 /* TODO(estade): animation? */
 .tile:only-of-type > .has-promo > .apps-promo-extras {
   display: block;
 }
 
 .apps-promo-extras {
   display: none;
   position: absolute;
   text-align: left;
   top: 0;
@@ skipping 17 matching lines @@
   white-space: nowrap;
   -webkit-border-image: url('../ntp/g-button-chocobo.png') 6 10 12 6;
 }
 
 .apps-promo-hide {
   font-size: 90%;
   margin-top: 2px;
   text-decoration: underline;
   -webkit-margin-start: 5px;
 }