Samael Wang a175a57a4e Bug 1364364 - Part 5.2: Remove browser.sessionhistory.cache_subframes and fix test cases relying on it. r=smaug
browser.sessionhistory.cache_subframes has been disabled for 12yrs. It's not
actually maintained and it leaks content viewers. Using this unreliable feature
in test cases is a bad practice, so remove the pref completely and fix existing
test cases.

MozReview-Commit-ID: 3tQLpsqmmaq

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extra : rebase_source : ce6e27c7d422f32dec858712eba5ed8011ee8039
2017-09-05 16:02:04 +08:00
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