Compile rtc_base_objc and rtc_api_objc for Mac

webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_info_objc.mm

Index: webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_info_objc.mm
diff --git a/webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_info_objc.mm b/webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_info_objc.mm
index d3f2188bae6923ef5e8c7c7cbb30a26623cd3bb6..20cfed6a7c2fbb983767ea057e5efd699ede11f8 100644
--- a/webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_info_objc.mm
+++ b/webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_info_objc.mm
@@ -60,10 +60,12 @@ using namespace webrtc;
 {
     NSString* strTitle = [NSString stringWithFormat:@"%s", dialogTitleUTF8];
     NSString* strButton = @"Alright";
-    NSAlert* alert = [NSAlert alertWithMessageText:strTitle
-                      defaultButton:strButton
-                      alternateButton:nil otherButton:nil
-                      informativeTextWithFormat:@"Device %s is capturing", deviceUniqueIdUTF8];
+    NSAlert* alert = [[NSAlert alloc] init];
+    alert.messageText = strTitle;
+    [alert addButtonWithTitle:strButton];
+    alert.informativeText =
+        [NSString stringWithFormat:@"Device %s is capturing",
+                                   deviceUniqueIdUTF8];
     [alert setAlertStyle:NSInformationalAlertStyle];
     [alert runModal];
     return [NSNumber numberWithInt:0];
@@ -105,6 +107,9 @@ using namespace webrtc;
 
     bool successful = NO;
 
+// TODO(5478): Update deprecated APIs.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated"
     NSString* tempString = [tempCaptureDevice localizedDisplayName];
     successful = [tempString getCString:(char*)deviceName
                   maxLength:deviceNameLength encoding:NSUTF8StringEncoding];
@@ -122,6 +127,7 @@ using namespace webrtc;
         memset(deviceUniqueID, 0, deviceNameLength);
         return [NSNumber numberWithInt:-1];
     }
+#pragma clang diagnostic pop
 
     return [NSNumber numberWithInt:0];
 
@@ -179,9 +185,13 @@ using namespace webrtc;
     {
         [_captureDevicesInfo release];
     }
+// TODO(5478): Update deprecated APIs.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated"
     _captureDevicesInfo = [[NSArray alloc]
                             initWithArray:[QTCaptureDevice
                                            inputDevicesWithMediaType:QTMediaTypeVideo]];
+#pragma clang diagnostic pop
 
     _captureDeviceCountInfo = _captureDevicesInfo.count;