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We still don't honor the too-short delays (this CL actually makes us
more aggressive about not honoring them), but I've lowered the limit
to 1 minute, and we emit a warning to the console instead of erroring,
and we emit this warning even in dev mode since people were getting
surprised by the difference in behavior between dev and release.

I've also moved the frequency description into the create()
documentation from the chrome.alarms summary, at joemarini's request.

And I fixed the eventPages example to work with trunk Chrome.

BUG=168519,159879

Review URL: https://chromiumcodereview.appspot.com/11818010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@176004 0039d316-1c4b-4281-b951-d872f2087c98