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The impl now lives in /chromecast/device/bluetooth/le:le_impl target.
Necessary to introduce a separate implementation for Fuchsia platform.
LeScanManager::RestartScan was renamed to ResumeScan to better reflect
the usage.

Bug: b/148704118
Test: cast_bluetooth_unittests, cast_internal_bluetooth_unittests

Change-Id: Ie58b406b690954666b6eca96be30a26f2ad1effa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2160106Reviewed-by: Luke Halliwell (slow) <halliwell@chromium.org>
Commit-Queue: Marzena Dell'Aquila <mdellaquila@google.com>
Cr-Commit-Position: refs/heads/master@{#762162}