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This CL changes the web request API to use the main_frame and sub_frame resource
types for navigation preload requests. Currently these requests use the 'other'
resource type. This also requires separating the
content::ResourceType::kNavigationPreload type into distinct types for
main-frame and sub-frame.

BUG=965960

Change-Id: I82340a87d18d9ccb9dc16f66a4c4531aa0f0c94b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1666715Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676640}