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The update notifications were sent at every download progress and flooded the
file manager UI. This patch inserts a check on frequency so that the event
keeps the interval of certain (currently 1000) milliseconds.

BUG=138838
TEST=manually tested copying large files.

Review URL: https://chromiumcodereview.appspot.com/10834027

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149371 0039d316-1c4b-4281-b951-d872f2087c98