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The revised structure better reflects the separation between the
chromium::web Context service and the Runner app.

Also created a group() so that :gn_all can indirectly depend on
all things webrunner without having to exhaustively specify
all targets.

jam@ TBR'd because checkdeps is confused by FIDL includes which don't map
to the Chromium source tree structure.

TBR=jam@chromium.org

Bug: 822474
Change-Id: I3216fae6c5417d01acfd32a6280f985dfc9f043c
Reviewed-on: https://chromium-review.googlesource.com/1106646
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571675}