Revert 230998 "Prepopulate primary origin's directory database i..."

Reverting because it seems to cause Linux ASAN failures.

> Prepopulate primary origin's directory database if possible.
> 
> Before (with primary origin patch)
> 140~170 ms
> 
> After (excluding 1st launch for a new profile)
> 30~90 ms
> 
> The very first launch for a fresh profile is still slow as
> it needs to go through full initialization.
> 
> BUG=306030
> TEST=manual
> 
> Review URL: https://codereview.chromium.org/39823003

TBR=kinuko@chromium.org

Review URL: https://codereview.chromium.org/44073002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231002 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 231002