Rename a few MediaConfig::Video flags for consistency.

  enable_cpu_overuse_detection --> enable_cpu_adaptation
  disable_prerenderer_smoothing --> enable_prerenderer_smoothing

where the latter also gets opposite meaning.

Bug: none
Change-Id: Ic10de0871a87e86a899aefa72ecb7e46fcdeaa65
Reviewed-on: https://webrtc-review.googlesource.com/40280
Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21726}
diff --git a/api/mediaconstraintsinterface.cc b/api/mediaconstraintsinterface.cc
index 90a957c..5e6b218 100644
--- a/api/mediaconstraintsinterface.cc
+++ b/api/mediaconstraintsinterface.cc
@@ -197,7 +197,7 @@
                  &configuration->media_config.enable_dscp, nullptr);
   FindConstraint(
       constraints, MediaConstraintsInterface::kCpuOveruseDetection,
-      &configuration->media_config.video.enable_cpu_overuse_detection, nullptr);
+      &configuration->media_config.video.enable_cpu_adaptation, nullptr);
   FindConstraint(constraints, MediaConstraintsInterface::kEnableRtpDataChannels,
                  &configuration->enable_rtp_data_channel, nullptr);
   // Find Suspend Below Min Bitrate constraint.