Fix vie_encoder_unittest.cc.
This was broken in https://codereview.webrtc.org/2338133003/ Let ViEEncoder tell VideoSendStream about reconfigurations when I manually landed that cl without rebasing.
Shame on me.

BUG=webrtc:5687, webrtc:6371
TBR=mflodman@webrtc.org
NOTREECHECKS=true

Review URL: https://codereview.webrtc.org/2359153004 .

Cr-Commit-Position: refs/heads/master@{#14373}
diff --git a/webrtc/video/vie_encoder_unittest.cc b/webrtc/video/vie_encoder_unittest.cc
index 8c43fe5..1ab6e68 100644
--- a/webrtc/video/vie_encoder_unittest.cc
+++ b/webrtc/video/vie_encoder_unittest.cc
@@ -282,7 +282,7 @@
   vie_encoder_->OnBitrateUpdated(kTargetBitrateBps, 0, 0);
 
   // Capture a frame and wait for it to synchronize with the encoder thread.
-  vie_encoder_->IncomingCapturedFrame(CreateFrame(1, nullptr));
+  video_source_.IncomingCapturedFrame(CreateFrame(1, nullptr));
   sink_.WaitForEncodedFrame(1);
   EXPECT_EQ(1, sink_.number_of_reconfigurations());
 
@@ -292,7 +292,7 @@
   vie_encoder_->ConfigureEncoder(std::move(video_encoder_config), 1440);
 
   // Capture a frame and wait for it to synchronize with the encoder thread.
-  vie_encoder_->IncomingCapturedFrame(CreateFrame(2, nullptr));
+  video_source_.IncomingCapturedFrame(CreateFrame(2, nullptr));
   sink_.WaitForEncodedFrame(2);
   EXPECT_EQ(2, sink_.number_of_reconfigurations());
   EXPECT_EQ(9999, sink_.last_min_transmit_bitrate());