Bug 945973 (part 1) - Remove about:memory's is-a-sentence description check.  r=mccr8.

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extra : rebase_source : bf47145a953a23b73fa1e7c441b695ffeceafbb8
Bug 945973 (part 2) - Don't complain if there aren't any "explicit" reports for a process.  r=mccr8.

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extra : rebase_source : 05129260b8a3e7cfbdadcecffe4c18715254323c
Bug 945973 (part 3) - Fix some trivial reporter/report confusions in aboutMemory.js.  r=mccr8.

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extra : rebase_source : 12eec13cd507100fa29bf798372784d5d8bcfbdb
Bug 945973 (part 4) - Add SystemMemoryReporter, which presents Linux-specific, system-wide memory measurements taken from the OS.  r=glandium.

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extra : rebase_source : 032d1d2944b790ac9e9e4d7f18c8ac9d79858ef3
Bug 950497 - Make self-referencing CSS variables invalid even if they have fallback. r=dbaron