Make unit_tests compile in Mac GN

components/crash.gypi

Index: components/crash.gypi
diff --git a/components/crash.gypi b/components/crash.gypi
index 8ad506d283479c108d41555f9c4283c086eaf4b2..9d6480ddab9d4328db02ab41f32afd773ea35d39 100644
--- a/components/crash.gypi
+++ b/components/crash.gypi
@@ -112,6 +112,8 @@
           # crash_component_breakpad_mac_to_be_deleted for old Breakpad behavior on
           # all platforms, or preferably, depend on crash_component to get Breakpad
           # everywhere except for Mac, where you will get Crashpad.
+          #
+          # GN version: //components/crash/content/app:app_non_mac
           'target_name': 'crash_component_non_mac',
           'variables': {
             'conditions': [
@@ -220,6 +222,8 @@
           # removed shortly and all consumers will be expected to use Crashpad as
           # the Mac crash-reporting client. See the comment in the
           # crash_component_non_mac target for more details.
+          #
+          # GN version: //components/crash/content/app:app_breakpad_mac_to_be_deleted
           'target_name': 'crash_component_breakpad_mac_to_be_deleted',
           'variables': {
             'conditions': [