Docs: Remove Send Feedback button

"Report a bug" -> "Report a content bug"
Cleanup of old CSS

BUG=

Review URL: https://codereview.chromium.org/836833002

Cr-Commit-Position: refs/heads/master@{#310195}

chrome/common/extensions/docs/static/sass/_article.scss

@@ -102,8 +102,6 @@ $toc-width: 28%;
 
 // Footer at bottom of articles
 #cc-info {
-  @include display-flex();
-  @include align-items(center);
   font-style: italic;
   //font-size: $small-label-size;
   font-size: 0.8em;
@@ -112,9 +110,6 @@ $toc-width: 28%;
     width: 90px;
     height: 32px;
   }
-  .last-updated {
-    @include flex(1);
-  }
 }
 
 // Multi-step codelabs

chrome/common/extensions/docs/templates/private/cc.html

 <footer id="cc-info">
-  <button id="send-feedback" class="google-button" data-feedback>Send Feedback</button>
   <!--p class="last-updated">Last updated August 2, 2013.</p-->
   <p class="cc-logo">Content available under the <a href="http://creativecommons.org/licenses/by/3.0/">CC-By 3.0 license</a></p>
 </footer>

chrome/common/extensions/docs/templates/private/site.html

@@ -60,7 +60,7 @@
       <div class="g-section g-tpl-50-50">
         <div class="g-unit g-first">
           <nav class="links">
-            <a href="https://www.google.com/">Google</a><a href="https://developers.google.com/site-terms">Terms of Service</a><a href="http://www.google.com/intl/en/privacy/">Privacy Policy</a><a href="" data-feedback>Report a bug</a>
+            <a href="https://www.google.com/">Google</a><a href="https://developers.google.com/site-terms">Terms of Service</a><a href="http://www.google.com/intl/en/privacy/">Privacy Policy</a><a href="http://crbug.com/new" data-feedback>Report a content bug</a>
           </nav>
         </div>
         <div class="g-unit g-last">