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This change replaces the header modification logic implemented in
ChromeResourceDispatchHostDelegate with a URLLoaderThrottle that is
configured for all navigation requests.

To support modifying headers (in addition to removing them) before
following a redirect a |modified_request_headers| parameter has been
added to URLLoaderThrottle::WillRedirectRequest().

Bug: 789670
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: Ibd58b0367bbe2a519dfb1cf85a4e5e6ec7eeeffa
Reviewed-on: https://chromium-review.googlesource.com/1139089
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584270}