CrOs first-run UI polished.

chrome/browser/resources/chromeos/first_run/app/main.html

Index: chrome/browser/resources/chromeos/first_run/app/main.html
diff --git a/chrome/browser/resources/chromeos/first_run/app/main.html b/chrome/browser/resources/chromeos/first_run/app/main.html
index 0810b76d957e15c903637e18d2caac5576e0b205..2931dc5e1525486fab5b12d1a29018ba9f5eb65e 100644
--- a/chrome/browser/resources/chromeos/first_run/app/main.html
+++ b/chrome/browser/resources/chromeos/first_run/app/main.html
@@ -7,6 +7,7 @@
     <link rel="stylesheet" href="chrome://resources/css/apps/common.css">
     <link rel="stylesheet" href="chrome://resources/css/apps/topbutton_bar.css">
     <link rel="stylesheet" href="../step.css">
+    <link rel="stylesheet" href="../preload.css">
     <link rel="stylesheet" href="style.css">
     <script src="chrome://resources/js/load_time_data.js"></script>
     <script src="chrome://resources/js/util.js"></script>
@@ -30,11 +31,9 @@
         <span i18n-content="greetingText2"></span>
       </p>
       <div class="controls">
-        <div class="margin-top"></div>
         <button i18n-content="greetingButton"
             class="next-button custom-appearance blue-button" tabindex="0">
         </button>
-        <div class="margin-bottom"></div>
       </div>
       <include src="greeting_image_[GREETING_IMAGE].html">
     </div>