Obj-C SDK Cleanup

This CL separates the files under sdk/objc into logical directories, replacing
the previous file layout under Framework/.

A long term goal is to have some system set up to generate the files under
sdk/objc/api (the PeerConnection API wrappers) from the C++ code. In the shorter
term the goal is to abstract out shared concepts from these classes in order to
make them as uniform as possible.

The separation into base/, components/, and helpers/ are to differentiate between
the base layer's common protocols, various utilities and the actual platform
specific components.

The old directory layout that resembled a framework's internal layout is not
necessary, since it is generated by the framework target when building it.

Bug: webrtc:9627
Change-Id: Ib084fd83f050ae980649ca99e841f4fb0580bd8f
Reviewed-on: https://webrtc-review.googlesource.com/94142
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Commit-Queue: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24493}
diff --git a/examples/objcnativeapi/objc/objccallclient.mm b/examples/objcnativeapi/objc/objccallclient.mm
index 0e3b8e0..c384da3 100644
--- a/examples/objcnativeapi/objc/objccallclient.mm
+++ b/examples/objcnativeapi/objc/objccallclient.mm
@@ -12,9 +12,10 @@
 
 #include <utility>
 
-#import <WebRTC/RTCCameraPreviewView.h>
-#import <WebRTC/RTCVideoCodecFactory.h>
-#import <WebRTC/RTCVideoRenderer.h>
+#import "sdk/objc/base/RTCVideoRenderer.h"
+#import "sdk/objc/components/video_codec/RTCDefaultVideoDecoderFactory.h"
+#import "sdk/objc/components/video_codec/RTCDefaultVideoEncoderFactory.h"
+#import "sdk/objc/helpers/RTCCameraPreviewView.h"
 
 #include "absl/memory/memory.h"
 #include "api/audio_codecs/builtin_audio_decoder_factory.h"
@@ -22,10 +23,10 @@
 #include "api/peerconnectioninterface.h"
 #include "media/engine/webrtcmediaengine.h"
 #include "modules/audio_processing/include/audio_processing.h"
-#include "sdk/objc/Framework/Native/api/video_capturer.h"
-#include "sdk/objc/Framework/Native/api/video_decoder_factory.h"
-#include "sdk/objc/Framework/Native/api/video_encoder_factory.h"
-#include "sdk/objc/Framework/Native/api/video_renderer.h"
+#include "sdk/objc/native/api/video_capturer.h"
+#include "sdk/objc/native/api/video_decoder_factory.h"
+#include "sdk/objc/native/api/video_encoder_factory.h"
+#include "sdk/objc/native/api/video_renderer.h"
 
 namespace webrtc_examples {