[iOS/GN] Fix generation of .dSYM for fat binary builds.

components/cronet/ios/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/buildflag_header.gni")
 import("//build/config/ios/rules.gni")
 import("//build/config/mac/symbols.gni")
 import("//build/mac/tweak_info_plist.gni")
 import("//build/util/version.gni")
 import("//chrome/version.gni")
@@ skipping 89 matching lines @@
     "cronet_c_for_grpc.h",
   ]
 
   sources = [
     "Cronet.h",
     "Cronet.mm",
   ]
 
   configs -= [ "//build/config/compiler:default_symbols" ]
   configs += [ "//build/config/compiler:symbols" ]
-  configs += [ "//build/config/mac:strip_all" ]
 }
 
 bundle_data("cronet_test_bundle_data") {
   testonly = true
   sources = [
     "//net/data/ssl/certificates/quic_test.example.com.crt",
     "//net/data/ssl/certificates/quic_test.example.com.key",
     "//net/data/ssl/certificates/quic_test.example.com.key.pkcs8",
     "//net/data/ssl/certificates/quic_test.example.com.key.sct",
   ]
@@ skipping 73 matching lines @@
     ]
   }
 
   group("cronet_package") {
     deps = [
       ":cronet_package_copy",
       ":generate_license",
     ]
   }
 }