Enable complete_static_lib on Mac and iOS

webrtc/BUILD.gn

Index: webrtc/BUILD.gn
diff --git a/webrtc/BUILD.gn b/webrtc/BUILD.gn
index f979ff1147d1934f78cd233452e47b212a5e9cea..c928dd396d7dade5167b1ae8a0c451966d7be68d 100644
--- a/webrtc/BUILD.gn
+++ b/webrtc/BUILD.gn
@@ -231,17 +231,7 @@ if (!build_with_chromium) {
       "call.h",
       "config.h",
     ]
-
-    # complete_static_lib doesn't work on Mac since libtool cannot support
-    # multiple objects with the same filenames (https://bugs.webrtc.org/6418).
-    if (is_win || is_linux || is_android) {
-      complete_static_lib = true
-    } else {
-      # TODO(kjellander): Remove this whenever possible. GN's static_library
-      # target type requires at least one object to avoid errors linking.
-      sources += [ "no_op_function.cc" ]
-    }
-
+    complete_static_lib = true
     defines = []
 
     deps = [