Bookmarks may create a race condition which
results in syntax errors. The more files are parsed
in parallel the higher the probability that the error
occurs.
Unfortunately it is not possible to simply revert the
CLs related to Bookmarks.

BUG=chromium:527930,chromium:510825
LOG=Y

Review URL: https://codereview.chromium.org/1315173007

Cr-Commit-Position: refs/heads/master@{#30594}