TimeController: Rename Sleep to AdvanceTime.

This change renames TimeController's Sleep method to AdvanceTime, unifying
the same name with the same semantic as for downstream projects.

Bug: webrtc:11154
Change-Id: Id79bcf0eafcd0b47a76407ba220479d84df5a736
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/161092
Commit-Queue: Markus Handell <handellm@webrtc.org>
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29989}
diff --git a/video/BUILD.gn b/video/BUILD.gn
index 68cee87..6c8565b 100644
--- a/video/BUILD.gn
+++ b/video/BUILD.gn
@@ -647,7 +647,7 @@
       "../test:test_common",
       "../test:test_support",
       "../test:video_test_common",
-      "../test/time_controller:time_controller",
+      "../test/time_controller",
       "//testing/gtest",
       "//third_party/abseil-cpp/absl/algorithm:container",
       "//third_party/abseil-cpp/absl/memory",