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Moved connection-help out of AboutUI and into its own WebUI, also
separated strings in the grd file, and implemented the content as an
HTML template that is filled with those strings.
Compression was also enabled for resources.

Bug: 813792
Change-Id: Ibc3e86206a7662490570cecff4a304030ba767f2
Reviewed-on: https://chromium-review.googlesource.com/957877
Commit-Queue: Carlos IL <carlosil@chromium.org>
Reviewed-by: Edward Jung <edwardjung@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544775}