Bug 918299 - Disable content/media/test/* mochitest timeouts on B2G for causing mochitest-3 runs to abort midway through

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extra : rebase_source : 06d5097efac8ff1197216c2b87709f50b5c39f26
Bug 719186 - Disable test_bug413310.html for too many intermittent failures

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extra : rebase_source : 94e1e52bf42254e06ea2514e91da3bb8cc5c33b7
Bug 859075 - Disable "Dynamic name" test in test_window-named-properties.html for too many intermittent failures

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extra : rebase_source : ea9509b2772c4df1cfe4f2187f7316faf16b3dcb
Bug 874429 - Disable test_form_autocomplete.html for too many intermittent failures

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extra : rebase_source : 71a634c0f111b981bcbef72092ab430cbe5b5c7d
Bug 886781 - Disable test_movement_by_characters.html on Windows 8 for too many intermittent failures

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extra : rebase_source : 608a5680e1e7bcd9ab87b732b0366512abbc1529
Bug 895390 - Disable browser_privatebrowsing_cache.js for too many intermittent failures
Bug 897108 - Disable test_playback_rate_playpause.html for too many intermittent failures
Bug 901102 - Disable test_streams_element_capture_reset.html on B2G for too many intermittent failures
Bug 907899 - Mark 759036-1.html as random-if on Android 2.2 for too many intermittent failures
Bug 907903 - Mark 759036-2.html as random-if on Android 2.2 for too many intermittent failures
Bug 915350 - Disable testBookmarklets, testHistory, testTabHistory & testBookmarkKeyword for too many intermittent failures
Bug 546169 - Disable browser_bug415846.js for too many intermittent failures
Bug 918321 - Remove some dead code from the JS engine; r=luke