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Navigation to chrome://predictors cause a crash if it's the first
navigation after profile creation. The reason is that ResourcePrefetchPredictor
is initialized only after the first commited navigation excluding a navigation
to NTP. On the other hand, WebUI predictors handler doesn't check that the
predictor was initialized before accessing the field that is nullptr in
uninitialized state.

This CL turns on the initialization of ResourcePrefetchPredictor after the
navigation to NTP and adds a check for a uninitialized state in WebUI handler.

Bug: 715525
Change-Id: I9382e892ce713d2b0beb406be344df64e2d5dd3d
Reviewed-on: https://chromium-review.googlesource.com/575989
Commit-Queue: Alexandr Ilin <alexilin@chromium.org>
Reviewed-by: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487465}