DocumentState now passed in commit.

DocumentState is now created in content and passed all the way down to
FrameLoader::CommitNavigation to be put directly into the DocumentLoader.
In DidCreateDocumentLoader we now only create the DocumentState for
cases where the content layer was never yet aware, such as
DocumentLoader from a frame init and Renderer initiated navigations.

A future patch is on its way to remove PendingNavigationParams and build
DocumentState directly from parameters.

Bug: 789577
Change-Id: Iffe7804784b13afc7f9d708828039d723b36ebbf
Reviewed-on: https://chromium-review.googlesource.com/1105985
Reviewed-by: Camille Lamy <[email protected]>
Reviewed-by: Daniel Cheng <[email protected]>
Commit-Queue: Arthur Hemery <[email protected]>
Cr-Commit-Position: refs/heads/master@{#572242}
16 files changed