Bug 1082545 - Make fastSeek always fast. r=sotaro

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extra : rebase_source : 4e12b971b2ee18931a54d30d51fc71437e095cdd
Bug 1092888 - Part 1: Remove preference for selection carets with non-editable fields support. r=roc

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extra : rebase_source : 23e1c11c1a89a5e5fa4d80af6abace7d1c7e2012
Bug 1092888 - Part 2: Check pointer of FrameSelection and Selection is valid. r=roc

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extra : rebase_source : 9e343626d67f6d9d4435535e3d10535ca1006cf0
Bug 1092888 - Part 3: Fix test fails on 824080-1/3/4/5.html. r=roc

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extra : rebase_source : b9e1b6289275cb34067cf1dca71a258de7379a95