bookmarks: Remove bookmark time migration code.
bookmarks: Remove bookmark time migration code.

Revision r24417 resulted in some time 'fixing' code in the bookmark manager.
The code in question was added to BookmarkCodec::DecodeNode() where it checks
whether the date is before 1970 or not.

The times on disk will get updated the next time the user adds or modifies a
bookmark. This will only be incorrect for Linux and Mac users we had before
this change went in.

After a "while" all these users should get updated times and we can remove
this code. And that "while" after 3 years and 8 months arrived, it's time to
get rid of this migration code.

BUG=20264
R=brettw@chromium.org
NOTRY=True

Review URL: https://chromiumcodereview.appspot.com/15090002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@202105 0039d316-1c4b-4281-b951-d872f2087c98

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