Move OneWriterSeqLock and SharedMemorySeqLockBuffer from content/ to device/base/synchronization

The reason to move it to device/base/synchronization is that it is going to be used both for content/ Device Orientation and Gamepad and for device/ Generic Sensors.

Committed: https://crrev.com/b39a3082846d5877a15e8b7e18d66cb142abe8af
Review-Url: https://codereview.chromium.org/2358123005
Cr-Original-Commit-Position: refs/heads/master@{#422115}
Cr-Commit-Position: refs/heads/master@{#422203}
2 files changed