Exclude panel_mouse_watcher_timer.cc from win builds. Avoid duplicate definition of PanelMouseWatcher::GetInstance().
Exclude panel_mouse_watcher_timer.cc from win builds.
Avoid duplicate definition of PanelMouseWatcher::GetInstance().

BUG=None
TEST=Existing.

Review URL: http://codereview.chromium.org/8044022

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@102770 0039d316-1c4b-4281-b951-d872f2087c98

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