Remove kint64max.

base/sys_info.cc

Index: base/sys_info.cc
diff --git a/base/sys_info.cc b/base/sys_info.cc
index ebc2a2e301a59e3ba3c309790b3dd85e3064d97d..21bfb34d6d4a7831e53a4704897f61abc91c7dac 100644
--- a/base/sys_info.cc
+++ b/base/sys_info.cc
@@ -59,7 +59,7 @@ base::TimeDelta SysInfo::Uptime() {
   // This code relies on an implementation detail of TimeTicks::Now() - that
   // its return value happens to coincide with the system uptime value in
   // microseconds, on Win/Mac/iOS/Linux/ChromeOS and Android.
-  int64 uptime_in_microseconds = TimeTicks::Now().ToInternalValue();
+  int64_t uptime_in_microseconds = TimeTicks::Now().ToInternalValue();
   return base::TimeDelta::FromMicroseconds(uptime_in_microseconds);
 }