Bug 774315 - Close button and context menu to hide click-to-play plugin instances. Portions of the patch contributed by David Keeler. r=felipe
Bug 832148 - Remove AutoPtr. r=njn

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extra : rebase_source : b798d2ac8c56bd610cd52bc3ac86f585c18055c8
Bug 774315 - Followup to switch to using background-image/background-position for the close icon. r=me
Bug 826521 (part 1) - Add SizeOfIncludingThisEvenIfShared() for strings.  r=bz.

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extra : rebase_source : 5c10fc346ba0c5fa76d947a97254e9ebc49353e1
Bug 826521 (part 2) - Report memory used by event targets, especially XHRs.  r=bz.

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extra : rebase_source : 543f0e367ce73477d62eca544137a101108a97be
(no bug) Fix comment in typo, and remove stale XXXdholbert comment. Comment-only, DONTBUILD