In the .mm files use the crashpad::implicit_cast .. explicitly.

util/mac/launchd.mm

Index: util/mac/launchd.mm
diff --git a/util/mac/launchd.mm b/util/mac/launchd.mm
index 7aac68538ed56a57bc7591e01bb691c269855f0f..851e3fc64109111bd9e081cd39f8549c4c2a8a99 100644
--- a/util/mac/launchd.mm
+++ b/util/mac/launchd.mm
@@ -46,7 +46,7 @@ launch_data_t CFPropertyToLaunchData(CFPropertyListRef property_cf) {
         }
 
         CFPropertyListRef value_cf =
-            implicit_cast<CFPropertyListRef>([dictionary_ns objectForKey:key]);
+            crashpad::implicit_cast<CFPropertyListRef>([dictionary_ns objectForKey:key]);
         launch_data_t value_launch = CFPropertyToLaunchData(value_cf);
         if (!value_launch) {
           return nullptr;
@@ -66,7 +66,7 @@ launch_data_t CFPropertyToLaunchData(CFPropertyListRef property_cf) {
 
       for (id element_ns in array_ns) {
         CFPropertyListRef element_cf =
-            implicit_cast<CFPropertyListRef>(element_ns);
+            crashpad::implicit_cast<CFPropertyListRef>(element_ns);
         launch_data_t element_launch = CFPropertyToLaunchData(element_cf);
         if (!element_launch) {
           return nullptr;