Cleanup unused Obj-C VideoFrame constructors

These interfaces were deprecated 6 years ago and have not been
functional for a long time. It is safe to remove them.

Bug: None
Change-Id: Icbc85758551a96b8da10fbf16a1771c3641d1ac3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/366500
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Auto-Submit: Daniel.L (Byoungchan) Lee <daniel.l@hpcnt.com>
Commit-Queue: Kári Helgason <kthelgason@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#43291}
diff --git a/sdk/objc/base/RTCVideoFrame.h b/sdk/objc/base/RTCVideoFrame.h
index b004e21..5e8ee14 100644
--- a/sdk/objc/base/RTCVideoFrame.h
+++ b/sdk/objc/base/RTCVideoFrame.h
@@ -47,29 +47,6 @@
 - (instancetype)init NS_UNAVAILABLE;
 - (instancetype)new NS_UNAVAILABLE;
 
-/** Initialize an RTCVideoFrame from a pixel buffer, rotation, and timestamp.
- *  Deprecated - initialize with a RTCCVPixelBuffer instead
- */
-- (instancetype)initWithPixelBuffer:(CVPixelBufferRef)pixelBuffer
-                           rotation:(RTCVideoRotation)rotation
-                        timeStampNs:(int64_t)timeStampNs
-    DEPRECATED_MSG_ATTRIBUTE("use initWithBuffer instead");
-
-/** Initialize an RTCVideoFrame from a pixel buffer combined with cropping and
- *  scaling. Cropping will be applied first on the pixel buffer, followed by
- *  scaling to the final resolution of scaledWidth x scaledHeight.
- */
-- (instancetype)initWithPixelBuffer:(CVPixelBufferRef)pixelBuffer
-                        scaledWidth:(int)scaledWidth
-                       scaledHeight:(int)scaledHeight
-                          cropWidth:(int)cropWidth
-                         cropHeight:(int)cropHeight
-                              cropX:(int)cropX
-                              cropY:(int)cropY
-                           rotation:(RTCVideoRotation)rotation
-                        timeStampNs:(int64_t)timeStampNs
-    DEPRECATED_MSG_ATTRIBUTE("use initWithBuffer instead");
-
 /** Initialize an RTCVideoFrame from a frame buffer, rotation, and timestamp.
  */
 - (instancetype)initWithBuffer:(id<RTC_OBJC_TYPE(RTCVideoFrameBuffer)>)frameBuffer
diff --git a/sdk/objc/base/RTCVideoFrame.mm b/sdk/objc/base/RTCVideoFrame.mm
index a5d23bb..cf73ca5 100644
--- a/sdk/objc/base/RTCVideoFrame.mm
+++ b/sdk/objc/base/RTCVideoFrame.mm
@@ -43,26 +43,6 @@
                                                   timeStampNs:_timeStampNs];
 }
 
-- (instancetype)initWithPixelBuffer:(CVPixelBufferRef)pixelBuffer
-                           rotation:(RTCVideoRotation)rotation
-                        timeStampNs:(int64_t)timeStampNs {
-  // Deprecated.
-  return nil;
-}
-
-- (instancetype)initWithPixelBuffer:(CVPixelBufferRef)pixelBuffer
-                        scaledWidth:(int)scaledWidth
-                       scaledHeight:(int)scaledHeight
-                          cropWidth:(int)cropWidth
-                         cropHeight:(int)cropHeight
-                              cropX:(int)cropX
-                              cropY:(int)cropY
-                           rotation:(RTCVideoRotation)rotation
-                        timeStampNs:(int64_t)timeStampNs {
-  // Deprecated.
-  return nil;
-}
-
 - (instancetype)initWithBuffer:(id<RTC_OBJC_TYPE(RTCVideoFrameBuffer)>)buffer
                       rotation:(RTCVideoRotation)rotation
                    timeStampNs:(int64_t)timeStampNs {