Bug 901908 - Mark a jit-test as slow. r=h4writer

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extra : rebase_source : b5c233a903d90e8b07e86c6d2fbd8bd06a70e45f
Bug 912702 - Minimize the #includes in content/media; r=roc
bug 910518 - check httpchannel for listener release on redirect callback r=jduell

--HG--
extra : rebase_source : 36a8adb0f863f01576b0991f10a0252e708f49e2
Fix an include guard in gfx/2d, no bug, r=me
Bug 870420 - Require Python 2.7.3+ to build; r=ted