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This CL migrates the legacy SetPermission IPC message
to the new Mojo defined in WebTestClient interface.

Mojo doesn't support base::Optional<int>. So, this CL passes
a value if it exists. It the value doesn't exist, a minimum
integer value is passed instead. Then, the handler function sets
the passed value to base::Optional<> again.

Bug: 1039247
Change-Id: I75850e1d642812c7e930a38e317b3eccda51e8ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2045270
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741092}