cricket::VideoFrame cleanup. New width() and height(). Deleted GetChroma* methods.

webrtc/api/objc/RTCVideoFrame.h

Index: webrtc/api/objc/RTCVideoFrame.h
diff --git a/webrtc/api/objc/RTCVideoFrame.h b/webrtc/api/objc/RTCVideoFrame.h
index 8ed23ba82c0726cb22162788989b57f96a733cb4..3a13b8ff30a3b416c742a1375f50f4182699c03b 100644
--- a/webrtc/api/objc/RTCVideoFrame.h
+++ b/webrtc/api/objc/RTCVideoFrame.h
@@ -21,7 +21,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property(nonatomic, readonly) size_t height;
 @property(nonatomic, readonly) size_t chromaWidth;
 @property(nonatomic, readonly) size_t chromaHeight;
-@property(nonatomic, readonly) size_t chromaSize;
 // These can return NULL if the object is not backed by a buffer.
 @property(nonatomic, readonly, nullable) const uint8_t *yPlane;
 @property(nonatomic, readonly, nullable) const uint8_t *uPlane;