Refactoring: Merge VideoSenderConfig and AudioSenderConfig.

media/cast/sender/fake_software_video_encoder.cc

Index: media/cast/sender/fake_software_video_encoder.cc
diff --git a/media/cast/sender/fake_software_video_encoder.cc b/media/cast/sender/fake_software_video_encoder.cc
index a9190467edd6c5629b9158d4c29066ebde6c60c7..7a24750939d76cf4469c1a97c41005b3f74a6d0c 100644
--- a/media/cast/sender/fake_software_video_encoder.cc
+++ b/media/cast/sender/fake_software_video_encoder.cc
@@ -18,11 +18,13 @@ namespace media {
 namespace cast {
 
 FakeSoftwareVideoEncoder::FakeSoftwareVideoEncoder(
-    const VideoSenderConfig& video_config)
+    const FrameSenderConfig& video_config)
     : video_config_(video_config),
       next_frame_is_key_(true),
       frame_id_(FrameId::first()),
-      frame_size_(0) {}
+      frame_size_(0) {
+  DCHECK_GT(video_config_.max_frame_rate, 0);
+}
 
 FakeSoftwareVideoEncoder::~FakeSoftwareVideoEncoder() {}