Replace test::FrameGenerator::ChromaGenerator with new FrameGenerator::SquareGenerator

webrtc/modules/video_coding/video_sender_unittest.cc

Index: webrtc/modules/video_coding/video_sender_unittest.cc
diff --git a/webrtc/modules/video_coding/video_sender_unittest.cc b/webrtc/modules/video_coding/video_sender_unittest.cc
index 50e17bfe70c18452c12f9e9a56383873ac5d87ff..81eca3bc05658bec57877bb0ae322b935af1827f 100644
--- a/webrtc/modules/video_coding/video_sender_unittest.cc
+++ b/webrtc/modules/video_coding/video_sender_unittest.cc
@@ -404,9 +404,9 @@ class TestVideoSenderWithVp8 : public TestVideoSender {
     const char* input_video = "foreman_cif";
     const int width = 352;
     const int height = 288;
-    generator_.reset(FrameGenerator::CreateFromYuvFile(
+    generator_ = FrameGenerator::CreateFromYuvFile(
         std::vector<std::string>(1, test::ResourcePath(input_video, "yuv")),
-        width, height, 1));
+        width, height, 1);
 
     codec_ = MakeVp8VideoCodec(width, height, 3);
     codec_.minBitrate = 10;