Looks like a bug in Chromium: bluetooth_uuid.* was moved to
//device/bluetooth/public/cpp/, but BUILD.gn in
extensions/common/api/bluetooth/ didn't get updated with the
new dependency.

Chromium change:

https://chromium.googlesource.com/chromium/src/+/47659c4b35f4a5ca96938b56cdaa19c8064f2380

commit 47659c4b35f4a5ca96938b56cdaa19c8064f2380
Author: Jason Majors <jmajors@google.com>
Date:   Mon Jul 8 18:23:28 2019 +0000

    Refactor //device to move bluetooth_uuid.* to //device/bluetooth/public/cpp/ .

    Moving these files to public/cpp to change the dependency structure. Other
    components that need the bluetooth UUID can depend on this new library, without
    having to depend on the entire //device library.
    Moved the bluetooth UUID to //device/bluetooth/public/cpp to prevent dependency
    cycles.

    Bug: 976964