Use the new ScopedMachVM class and the MACH_LOG family of logging macros

base/time/time_mac.cc

Index: base/time/time_mac.cc
diff --git a/base/time/time_mac.cc b/base/time/time_mac.cc
index 6089efbbb6b5d231a034096dd373b3ead1e428c1..515cafe35b278fb5f8ea52f3342ce66feb49ebad 100644
--- a/base/time/time_mac.cc
+++ b/base/time/time_mac.cc
@@ -15,6 +15,7 @@
 
 #include "base/basictypes.h"
 #include "base/logging.h"
+#include "base/mac/mach_logging.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/mac/scoped_mach_port.h"
 
@@ -46,7 +47,7 @@ uint64_t ComputeCurrentTicks() {
     // whether mach_timebase_info has already been called.  This is
     // recommended by Apple's QA1398.
     kern_return_t kr = mach_timebase_info(&timebase_info);
-    DCHECK_EQ(KERN_SUCCESS, kr);
+    MACH_DCHECK(kr == KERN_SUCCESS, kr) << "mach_timebase_info";
   }
 
   // mach_absolute_time is it when it comes to ticks on the Mac.  Other calls
@@ -85,7 +86,7 @@ uint64_t ComputeThreadTicks() {
       THREAD_BASIC_INFO,
       reinterpret_cast<thread_info_t>(&thread_info_data),
       &thread_info_count);
-  DCHECK_EQ(KERN_SUCCESS, kr);
+  MACH_DCHECK(kr == KERN_SUCCESS, kr) << "thread_info";
 
   return (thread_info_data.user_time.seconds *
               base::Time::kMicrosecondsPerSecond) +