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..5f60526262ec9750bb1bfaf942638f83f16f5088 100644
--- a/util/mac/launchd.mm
+++ b/util/mac/launchd.mm
@@ -16,7 +16,6 @@
 
 #import <Foundation/Foundation.h>
 
-#include "base/basictypes.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_launch_data.h"
 #include "base/mac/scoped_cftyperef.h"
@@ -45,8 +44,8 @@ launch_data_t CFPropertyToLaunchData(CFPropertyListRef property_cf) {
           return nullptr;
         }
 
-        CFPropertyListRef value_cf =
-            implicit_cast<CFPropertyListRef>([dictionary_ns objectForKey:key]);
+        CFPropertyListRef value_cf = crashpad::implicit_cast<CFPropertyListRef>(
+            [dictionary_ns objectForKey:key]);
         launch_data_t value_launch = CFPropertyToLaunchData(value_cf);
         if (!value_launch) {
           return nullptr;
@@ -66,7 +65,7 @@ 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;