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This CL updates the FakePageHandler to use generated Mojo types.

Bug: 906508
Change-Id: Ib04a9118e7ad7de6ac1aa9dfdf2d232c3280034a
Reviewed-on: https://chromium-review.googlesource.com/c/1370232
Commit-Queue: Reka Norman <rekanorman@google.com>
Reviewed-by: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615454}