Clarify resolution change behaviors of video capture devices

media/video/capture/video_capture_types.cc

Index: media/video/capture/video_capture_types.cc
diff --git a/media/video/capture/video_capture_types.cc b/media/video/capture/video_capture_types.cc
index 17f2d654c6193e697b8dbc9a188bcaa099d4e74d..8aab6e58669d595ab6c28937e1e27db46dc341a9 100644
--- a/media/video/capture/video_capture_types.cc
+++ b/media/video/capture/video_capture_types.cc
@@ -59,6 +59,6 @@ std::string VideoCaptureFormat::PixelFormatToString(VideoPixelFormat format) {
   return "";
 }
 
-VideoCaptureParams::VideoCaptureParams() : allow_resolution_change(false) {}
-
+VideoCaptureParams::VideoCaptureParams()
+    : resolution_change_policy(RESOLUTION_POLICY_FIXED) {}
 }  // namespace media