Roll DOM Distiller JavaScript distribution package

Diff since last roll:
https://github.com/chromium/dom-distiller/compare/6e47a6727c...349b932fc2

Picked up changes:
349b932 Remove DOM Distiller dependency on scoped_ptr<T>::Pass().
8fa737b Add <pre> to nesting tags
7991208 Clean up attributes of image elements

BUG=557422,567955
TBR=mdjones@chromium.org

Review URL: https://codereview.chromium.org/1550133004

Cr-Commit-Position: refs/heads/master@{#367033}

DEPS

@@ -267,7 +267,7 @@ deps = {
     Var('chromium_git') + '/external/py_trace_event.git' + '@' + 'dd463ea9e2c430de2b9e53dea57a77b4c3ac9b30',
 
   'src/third_party/dom_distiller_js/dist':
-    Var('chromium_git') + '/external/github.com/chromium/dom-distiller-dist.git' + '@' + '7e5e3db1b6ddecee66fc5f643729fda40976fd39',
+    Var('chromium_git') + '/external/github.com/chromium/dom-distiller-dist.git' + '@' + 'e21fe06cb71327ec62431f823e783d7b02f97b26',
 
   'src/third_party/catapult':
     Var('chromium_git') + '/external/github.com/catapult-project/catapult.git' + '@' +

third_party/dom_distiller_js/README.chromium

 Name: dom-distiller-js
 URL: https://github.com/chromium/dom-distiller
-Version: 6e47a6727c
+Version: 349b932fc2
 License: BSD
 Security Critical: yes