Enable use of intermediate source set by iOS templates.

build/config/ios/rules.gni

 # 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/config/ios/ios_sdk.gni")
 import("//build/config/mac/base_rules.gni")
 import("//build/config/mac/symbols.gni")
 
 # Control whether an intermediate source_set is used when building executables
 # and shared_libraries for ios_app_bundle and ios_framework_bundle. This is a
 # temporary flag that will be removed once scoped_nsobject_unittest{_arc}.mm
 # tests are passing with this flag set to true (see crbug.com/637065)
-_use_intermediate_source_set = false
+_use_intermediate_source_set = true
 
 # Invokes lipo on multiple arch-specific binaries to create a fat binary.
 #
 # Arguments
 #
 #   arch_binary_target
 #     name of the target generating the arch-specific binaries, they must
 #     be named $target_out_dir/$toolchain_cpu/$arch_binary_output.
 #
 #   arch_binary_output
@@ skipping 1337 matching lines @@
       "-rpath",
       "-Xlinker",
       "@loader_path/Frameworks",
     ]
   }
 }
 
 set_defaults("ios_xctest_test") {
   configs = default_executable_configs
 }