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This CL moves decoding code for preloaded data (e.g. HSTS) under net/extras/preload_data so that it can be reused.

A future CL will use the net::extras::PreloadDecoder class to extract top 10K domain information from a preloaded data set.

Bug: 843361
Change-Id: I3026feaa9034f9c5d09232ea1d43cf1e69c48939
Reviewed-on: https://chromium-review.googlesource.com/1098311Reviewed-by: Nick Harper <nharper@chromium.org>
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569762}