Adds a delete button to chrome:offline-internals

chrome/browser/resources/offline_pages/offline_internals.html

Index: chrome/browser/resources/offline_pages/offline_internals.html
diff --git a/chrome/browser/resources/offline_pages/offline_internals.html b/chrome/browser/resources/offline_pages/offline_internals.html
index 3fe467a0343e78d91144127aae19845effa3974e..d6932d1a6c212071d8bddd695477e208d2824f2d 100644
--- a/chrome/browser/resources/offline_pages/offline_internals.html
+++ b/chrome/browser/resources/offline_pages/offline_internals.html
@@ -58,9 +58,14 @@
     <div id="page-actions-info"></div>
 
     <h2>Request Queue</h2>
+    <div>
+      <button id="delete-all">Delete all</button>

[chili, 2016/09/12 20:26:01]

nit: can we id this to delete-all-requests and delete-selected-requests?   This
will help with any name confusion with clear stored pages vs delete here (I'll
make a note to rename the cleared pages ids too)

[Pete Williamson, 2016/09/12 22:46:35]

Done.

+      <button id="delete-selected">Delete selected</button>
+    </div>
     <table class="request-queue-table">
       <thead>
         <tr>
+          <th>&nbsp;</th>
           <th>URL</th>
           <th>Created Timestamp</th>
           <th>Status</th>