Revert of Unify the macOS and iOS capturer implementations

webrtc/modules/video_capture/BUILD.gn

Index: webrtc/modules/video_capture/BUILD.gn
diff --git a/webrtc/modules/video_capture/BUILD.gn b/webrtc/modules/video_capture/BUILD.gn
index fa79ebbfd8e3ae3df93d41cd03d87181e9376649..d6e7dce45a364697d29f7d4f8e1308e853f3a25c 100644
--- a/webrtc/modules/video_capture/BUILD.gn
+++ b/webrtc/modules/video_capture/BUILD.gn
@@ -60,7 +60,7 @@
 
 if (!build_with_chromium) {
   config("video_capture_internal_impl_config") {
-    if (is_ios || is_mac) {
+    if (is_ios) {
       libs = [
         "AVFoundation.framework",
         "CoreMedia.framework",
@@ -103,6 +103,30 @@
         "linux/video_capture_linux.h",
       ]
       deps += [ "../..:webrtc_common" ]
+    }
+    if (is_mac) {
+      sources = [
+        "mac/qtkit/video_capture_qtkit.h",
+        "mac/qtkit/video_capture_qtkit.mm",
+        "mac/qtkit/video_capture_qtkit_info.h",
+        "mac/qtkit/video_capture_qtkit_info.mm",
+        "mac/qtkit/video_capture_qtkit_info_objc.h",
+        "mac/qtkit/video_capture_qtkit_info_objc.mm",
+        "mac/qtkit/video_capture_qtkit_objc.h",
+        "mac/qtkit/video_capture_qtkit_objc.mm",
+        "mac/qtkit/video_capture_qtkit_utility.h",
+        "mac/video_capture_mac.mm",
+      ]
+
+      libs = [
+        # For NSAlert in video_capture_qtkit_info_objc.mm.
+        "Cocoa.framework",
+
+        # For GetGestalt in video_capture_mac.mm.
+        "CoreServices.framework",
+        "CoreVideo.framework",
+        "QTKit.framework",
+      ]
     }
     if (is_win) {
       sources = [
@@ -125,16 +149,16 @@
 
       deps += [ "//third_party/winsdk_samples" ]
     }
-    if (is_ios || is_mac) {
-      sources = [
-        "objc/device_info.h",
-        "objc/device_info.mm",
-        "objc/device_info_objc.h",
-        "objc/device_info_objc.mm",
-        "objc/rtc_video_capture_objc.h",
-        "objc/rtc_video_capture_objc.mm",
-        "objc/video_capture.h",
-        "objc/video_capture.mm",
+    if (is_ios) {
+      sources = [
+        "ios/device_info_ios.h",
+        "ios/device_info_ios.mm",
+        "ios/device_info_ios_objc.h",
+        "ios/device_info_ios_objc.mm",
+        "ios/rtc_video_capture_ios_objc.h",
+        "ios/rtc_video_capture_ios_objc.mm",
+        "ios/video_capture_ios.h",
+        "ios/video_capture_ios.mm",
       ]
 
       cflags = [
@@ -159,6 +183,7 @@
   if (!is_android && rtc_include_tests) {
     rtc_test("video_capture_tests") {
       sources = [
+        "test/video_capture_main_mac.mm",
         "test/video_capture_unittest.cc",
       ]
 
@@ -190,7 +215,11 @@
         "../utility",
         "//testing/gtest",
       ]
-      deps += [ "//webrtc/test:test_support_main" ]
+      if (is_mac) {
+        deps += [ "//webrtc/test:test_support_main_threaded_mac" ]
+      } else {
+        deps += [ "//webrtc/test:test_support_main" ]
+      }
 
       if (is_clang) {
         # Suppress warnings from Chrome's Clang plugins.