Upstream Chrome on iOS source code [11/11].

Upstream all changes to enable compilation of the code
that has been upstreamed by the previous ten CLs and changes to to use the new factory.

Update the default provider factory to use chromium provider (it
will be merged with ChromeBrowserProvider eventually).


Review-Url: .
Cr-Commit-Position: refs/heads/master@{#439492}
94 files changed