Migrate <cr-dialog> from PaperDialogBehavior to native <dialog>.

chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.html

Index: chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.html
diff --git a/chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.html b/chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.html
index b471c22d415e4c77058627b2533f04a74894126d..97b3e81db977a641577c40bb603d9f6de0fc3afd 100644
--- a/chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.html
+++ b/chrome/browser/resources/settings/clear_browsing_data_dialog/clear_browsing_data_dialog.html
@@ -107,7 +107,7 @@
 
     <!-- #notice correctly places its own backdrop above #dialog and under
          itself, so when it is shown, #dialog should not use backdrop. -->
-    <cr-dialog id="dialog" with-backdrop="[[!showHistoryDeletionDialog_]]">
+    <dialog is="cr-dialog" id="dialog" with-backdrop="[[!showHistoryDeletionDialog_]]">

[Dan Beam, 2016/07/26 23:36:12]

nit: 80 col wrap

[dpapad, 2016/07/27 01:21:47]

Ah, I am realizing that |with-backdrop| is something that the new version of
<cr-dialog> does not take into account. Will need to come up with something to
accommodate that case.

       <div class="title">$i18n{clearBrowsingData}</div>
       <div class="body">
         <div class="row">
@@ -163,7 +163,7 @@
       <div class="button-container">
         <paper-spinner active="[[clearingInProgress_]]"></paper-spinner>
         <paper-button class="cancel-button" disabled="[[clearingInProgress_]]"
-            dialog-dismiss>$i18n{cancel}</paper-button>

[Dan Beam, 2016/07/26 23:36:12]

are you sure you got all of these? what about dialog-confirm?

[dpapad, 2016/07/27 01:21:47]

I had missed a dialog-confirm occurrence in
site_settings/site_data_details_dialog.html, updated now (guessing it is not
covered by tests). I verified that it works manually, but also discovered that
it throws a runtime exception even without my changes in some cases (will file
bug).

+            on-tap="onCancelTap_">$i18n{cancel}</paper-button>
         <paper-button class="action-button" disabled="[[clearingInProgress_]]"
             on-tap="onClearBrowsingDataTap_">
           $i18n{clearBrowsingData}
@@ -185,7 +185,7 @@
           </div>
         </div>
       </div>
-    </cr-dialog>
+    </dialog>
 
     <template is="dom-if" if="[[showHistoryDeletionDialog_]]" restamp>
       <settings-history-deletion-dialog id="notice"