Delete remnants of non-square pixel support from cricket::VideoFrame.

If ever needed, add some aspect ratio parameter, without pixel_width
and pixel_height arguments cluttering commonly used functions.

BUG=webrtc:5426

Committed: https://crrev.com/709513d4133107d5c02aed34a5ee99444c4d4e25
Cr-Commit-Position: refs/heads/master@{#11243}

Review URL: https://codereview.webrtc.org/1586613002

Cr-Commit-Position: refs/heads/master@{#11287}
diff --git a/talk/app/webrtc/videotrack_unittest.cc b/talk/app/webrtc/videotrack_unittest.cc
index 013d925..c30a98b 100644
--- a/talk/app/webrtc/videotrack_unittest.cc
+++ b/talk/app/webrtc/videotrack_unittest.cc
@@ -82,7 +82,7 @@
   ASSERT_FALSE(renderer_input == NULL);
 
   cricket::WebRtcVideoFrame frame;
-  frame.InitToBlack(123, 123, 1, 1, 0);
+  frame.InitToBlack(123, 123, 0);
   renderer_input->RenderFrame(&frame);
   EXPECT_EQ(1, renderer_1->num_rendered_frames());