Revert of Add a NavigationThrottle to the public content/ interface (patchset #18 id:350001 of https://codereview.chromium.org/1269813002/ )

Reason for revert:
linux_chromiium_chromeos_rel_ng => browser_test => SelectFileDialogExtensionBrowserTest seems to faile a lot, testing.

Original issue's description:
> Add a NavigationThrottle to the public content/ interface
>
> This CL adds a NavigationThrottle class to the public content/ interface. A NavigationThrottle is used to control the flow of navigations. It lives entirely on the UI thread. Eventually, all components that want the functionality of a ResourceThrottle for navigations should transition to a NavigationThrottle: the new architecture for navigations (browser-side navigation) will not support ResourceThrottles for main resources load. See https://docs.google.com/document/d/1ICLLQoC9EsZ-bWH4ZKRhPCIoZKn6pOj02SlGl6SKH6Y/edit?pli=1#heading=h.fmxjmgvbgg7x for the design doc.
>
> This Cl also transition the InterceptNavigationresourceThrottle to the Navigationthrottle model.
> BUG=504347
>
> Committed: https://crrev.com/394057986ff5d00a841a976f3bd8d599603acaa1
> Cr-Commit-Position: refs/heads/master@{#350092}

TBR=nasko@chromium.org,davidben@chromium.org,carlosk@chromium.org,fdegans@chromium.org,avi@chromium.org,creis@chromium.org,nick@chromium.org,asargent@chromium.org,sky@chromium.org,mnaganov@chromium.org,clamy@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=504347

Review URL: https://codereview.chromium.org/1350913008

Cr-Commit-Position: refs/heads/master@{#350157}

0 files changed, 0 insertions, 0 deletions