Simplify failure codepaths of MessagePumpLibevent::WatchFileDescriptor()
Simplify failure codepaths of MessagePumpLibevent::WatchFileDescriptor()

event_del is now called once if we reuse an event so there's no need to call it multiple times for each failure mode.

Review URL: http://codereview.chromium.org/235007

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@27107 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser