ntp4: make bubble wider

chrome/browser/resources/shared/css/bubble.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.
  */
 
 .bubble {
   /* These margins correlate to the difference between the tip of the arrow
    * and the bottom left of the bubble. */
   margin-left: -30px;
   margin-top: -8px;
   position: absolute;
   /* Height is dynamic, width fixed. */
-  width: 200px;
+  width: 300px;
   z-index: 9999;
 }
 
 .bubble-contents {
   left: 1px;
   padding: 10px;
   position: relative;
   text-align: left;
   top: 1px;
-  width: 198px;
+  width: 298px;
   z-index: 3;
 }
 
 .bubble-shadow {
   bottom: -2px;
   left: 0;
   position: absolute;
   right: 0;
   top: 0;
   z-index: 1;
@@ skipping 24 matching lines @@
 .bubble-arrow {
   border: 1px solid rgba(0, 0, 0, 0.3);
   -webkit-box-shadow: -2px 2px 4px rgba(0, 0, 0, 0.3);
 }
 
 .bubble-shadow,
 .bubble-contents {
   border-radius: 6px;
   box-sizing: border-box;
 }