Update to webrender 0.10.0
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Changes necessary to build servor with webrender 0.10.0
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SubpageId was originally introduced in 2013 to help iframes keep track of
their associated (children) pipelines. However, since each pipeline
already has a PipelineId, and those are unique, those are sufficient
to keep track of children.
Fix backward navigation
make use of history iterator
Add frame iterator
add different back logic
cleanup navigation_info
Add extra explanation for iter logic
Remove forward history on full frame tree
Rename navigation to traversal where appropriate
check full tree for can go back/forward
simplify frame iter logic
remove FrameIterator
cleanup history iter
reduce amount of vec allocations
removed extra parenthesis
Remove history iterator
cleanup after rebasing
avoid recursive vec allocation
remove full_frame_tree
remove_forward_history_in_frame_tree -> clear_joint_session_future
It's a pointless abstraction that propagates the obsolete chan terminology,
swaps the order in which the sender and receiver are returned, and hides a
source of panics.
