Move crash keys for command-line switches to components/crash so they can be set

components/crash/core/common/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.
 
 source_set("common") {
   sources = [
     "crash_keys.cc",
     "crash_keys.h",
   ]
 
   deps = [
     "//base",
   ]
 
   if (is_mac || is_ios) {
     sources += [
       "objc_zombie.h",
       "objc_zombie.mm",
     ]
   }
 }
 
 source_set("unit_tests") {
   testonly = true
+  sources = [
+    "crash_keys_unittest.cc",
+  ]
+
+  deps = [
+    ":common",
+    "//base",
+    "//testing/gtest",
+  ]
+
   if (is_mac || is_ios) {
-    sources = [
-      "objc_zombie_unittest.mm",
-    ]
-    deps = [
-      ":common",
-      "//base",
-      "//testing/gtest",
-    ]
+    sources += [ "objc_zombie_unittest.mm" ]
   }
 }