Change short/int16_t to uint16_t in third_party/blink/renderer/modules/bluetooth

- short/int16_t -> uint16_t considering importing the value from web_bluetooth.mojom
  and exporting the value through bluetooth_advertising_event.idl.
- Reference: https://google.github.io/styleguide/cppguide.html#Integer_Types

Bug: 929985
Change-Id: Ib910dce00f0382fa7688547583d9c09d65272e5f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1501772
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637576}
3 files changed