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This change deprecates the current GetNetworks function and removes the
old GetNetworksDeprecated function altogether. The new GetNetworks
function uses the NetworkConfiguration type used in other APIs instead
of the old WifiConfiguration type.

BUG=b:63738960
TEST=Compile and boot.

Change-Id: I4c00cf19b55fd90a322422ca91cd787084013d86
Reviewed-on: https://chromium-review.googlesource.com/573111
Commit-Queue: Abhishek Bhardwaj <abhishekbh@google.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488368}