Remove reference to stack_trace_ios.mm from base/BUILD.gn

base/BUILD.gn

 # Copyright (c) 2013 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/ui.gni")
 
 component("base") {
   external = true
   sources = [
     "../build/build_config.h",
@@ skipping 106 matching lines @@
     # allocator.gyp for details).
     "debug/leak_annotations.h",
     "debug/leak_tracker.h",
     "debug/proc_maps_linux.cc",
     "debug/proc_maps_linux.h",
     "debug/profiler.cc",
     "debug/profiler.h",
     "debug/stack_trace.cc",
     "debug/stack_trace.h",
     "debug/stack_trace_android.cc",
-    "debug/stack_trace_ios.mm",
     "debug/stack_trace_posix.cc",
     "debug/stack_trace_win.cc",
     "debug/trace_event.h",
     "debug/trace_event_android.cc",
     "debug/trace_event_impl.cc",
     "debug/trace_event_impl.h",
     "debug/trace_event_impl_constants.cc",
     "debug/trace_event_memory.cc",
     "debug/trace_event_memory.h",
     "debug/trace_event_synthetic_delay.cc",
@@ skipping 762 matching lines @@
   #    # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   #    'msvs_disabled_warnings': [
   #      4267,
   #    ],
   #  }],
   #],
   #'variables': {
   #  'optimize': 'max',
   #},
 }