Make some updates to extension iconography.

chrome/browser/resources/ntp4/new_tab.html

Index: chrome/browser/resources/ntp4/new_tab.html
diff --git a/chrome/browser/resources/ntp4/new_tab.html b/chrome/browser/resources/ntp4/new_tab.html
index ba71ff01d5475e14bfeba700c3ccc1ae853fa7b9..3ae53d5550673046fc9d2081fb77b4e530ba819e 100644
--- a/chrome/browser/resources/ntp4/new_tab.html
+++ b/chrome/browser/resources/ntp4/new_tab.html
@@ -141,25 +141,14 @@
   </div>
 </div>
 
-<!-- App Contents w/ Large Icon -->
-<div id="app-large-icon-template" class="app-contents">
+<!-- App Contents  -->
+<div id="app-icon-template" class="app-contents">
   <div class="app-img-container" aria-hidden="true">
     <img class="invisible" alt="">
   </div>
   <span class="title"></span>
 </div>
 
-<!-- App Contents w/ Small Icon -->
-<div id="app-small-icon-template" class="app-contents">
-  <div class="app-icon-div" aria-hidden="true">
-    <div class="app-img-container">
-      <img class="invisible" alt="">
-    </div>
-    <div class="color-stripe"></div>
-  </div>
-  <span class="title"></span>
-</div>
-
 </div>
 
 <!-- This is used to measure text in the current locale. It is not visible. -->