[base] Make FilePathWatcher::Watch virtual so that it can be mocked.

[base] Make FilePathWatcher::Watch virtual so that it can be mocked.

TEST=./base_unittests


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=123563

[szym, 2012-02-24 19:24:42]

James, it would help us test NetworkChangeNotifier if FilePathWatcher could be
mocked out. 

For example, to test net/dns/watching_file_reader.* we had to add a
FilePathWatcherShim which is just extraneous. I'm about to refactor that class
so this CL would help.

[szym, 2012-02-24 19:28:35]

I first looked at git annotate, but just realized that jhawkins is not in
OWNERS. James, you're off the hook.

[dmac, 2012-02-24 20:42:18]

lgtm

[commit-bot: I haz the power, 2012-02-24 20:43:48]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/szym@chromium.org/9447066/4

[szym, 2012-02-24 20:44:00]

On 2012/02/24 20:42:18, dmac wrote:
> lgtm

Thanks a bunch.

[commit-bot: I haz the power, 2012-02-24 22:18:53]

Change committed as 123563