Fix 64 bit truncation with inspector interfaces

Received data size is uint64_t. Propagate this through the interfaces.

BUG=879657

Change-Id: Ia43b03df934a2c9c8896250530f1533efddd8e45
Reviewed-on: https://chromium-review.googlesource.com/c/1401513
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#621185}
8 files changed