Bug 898967 - Remove the unused StreamBuffer::mForgottenUpTo member; r=roc

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extra : rebase_source : ef259872ebe3e49dad71a1ca28788c0e8a6ed05f
Bug 909927 - Minimize the #includes in layout/forms; r=mats

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extra : rebase_source : 92eb9ca6672e754a32dbfe3cd3494309671902d3