Amend dom-distiller script for bug ID and repo URLs

- Amend bug ID handling: one space after colon (:).
- Use GoB/gerrit URLs for diff and CL list.

Bug: 749769
Change-Id: I7ea67512da418c54405fd7ffb81d3bc24f70b9db
Reviewed-on: https://chromium-review.googlesource.com/1171846Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582669}

third_party/dom_distiller_js/update_domdistiller_js.sh

@@ -36,7 +36,7 @@
   git reset --hard ${new_gitsha}
   git log --oneline ${curr_gitsha}..${new_gitsha} > $changes
 
-  echo -n Bug: > $bugs
+  echo -n 'Bug: ' > $bugs
 
   # This extracts BUG= lines from the log, extracts the numbers part, removes
   # whitespace and deletes empty lines. Then, split on ',', sort, uniquify and
@@ -87,9 +87,10 @@
     echo "Roll DOM Distiller JavaScript distribution package"
     echo
     echo "Diff since last roll:"
-    echo "https://github.com/chromium/dom-distiller/compare/${curr_gitsha}...${new_gitsha}"
+    echo "https://chromium.googlesource.com/chromium/dom-distiller/+/${curr_gitsha}..${new_gitsha}"
     echo
     echo "Picked up changes:"
+    echo "https://chromium.googlesource.com/chromium/dom-distiller/+log/${curr_gitsha}..${new_gitsha}"
     cat $changes
     echo
     cat $bugs