[DevTools] Rework provisional load explicit calls to probes

Bug: 855189
Change-Id: Ibd8a9b67bcf8e3d8c4c62527f9cc89e97eb39b96
Reviewed-on: https://chromium-review.googlesource.com/c/1269459
Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597717}
10 files changed