Work around windows handles to temp files while deleting them.
Work around windows handles to temp files while deleting them.

Windows is stupid and weird and stupid. Or maybe I am all those things.
Apparently, while removing a temp file after telling chrome to cancel
downloading it still leaves windows to retain some handle to it for a very small amount of time so that
removing the temp file would fail. Try to work around by maintaining a list
of items to remove *after* the browser is shut down.

BUG=
TEST=

Review URL: http://codereview.chromium.org/3414001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@59386 0039d316-1c4b-4281-b951-d872f2087c98

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