Remove Chrome OS-related GN build configuration

third_party/breakpad/BUILD.gn

 # Copyright 2014 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.
 
 # This file was forked from breakpad/BUILD.gn in chromium.
 
 import("//testing/test.gni")
 
 config("tools_config") {
   include_dirs = [
@@ skipping 497 matching lines @@
       "src/common/simple_string_dictionary.cc",
       "src/common/simple_string_dictionary.h",
       "src/common/string_conversion.cc",
       "src/common/string_conversion.h",
     ]
 
     configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [ "//build/config/compiler:no_chromium_code" ]
     public_configs = [ ":client_config" ]
 
-    if (current_cpu == "arm" && is_chromeos) {
-      # Avoid running out of registers in
-      # linux_syscall_support.h:sys_clone()'s inline assembly.
-      cflags = [ "-marm" ]
-    }
-
     if (is_android) {
       sources += [ "src/common/android/breakpad_getcontext.S" ]
     }
 
     libs = [ "dl" ]
 
     include_dirs = [
       ".",
       "src",
       "src/client",
@@ skipping 253 matching lines @@
     sources = [
       "src/client/windows/sender/crash_report_sender.cc",
       "src/client/windows/sender/crash_report_sender.h",
       "src/common/windows/http_upload.cc",
       "src/common/windows/http_upload.h",
     ]
     configs += [ ":sender_config" ]
     public_configs = [ ":sender_config" ]
   }
 }