Fix presubmit errors.

src/platform-macos.cc

Index: src/platform-macos.cc
diff --git a/src/platform-macos.cc b/src/platform-macos.cc
index c0ecdac0ecd818a50cce8a91b5d16177a65a53c2..c0810649fe52cd02719db284b204f9e7d27678b6 100644
--- a/src/platform-macos.cc
+++ b/src/platform-macos.cc
@@ -519,7 +519,7 @@ class Sampler::PlatformData : public Malloced {
 #define REGISTER_FIELD(name) __r ## name
 #else
 #define REGISTER_FIELD(name) r ## name
-#endif // __DARWIN_UNIX03
+#endif  // __DARWIN_UNIX03
 #elif V8_HOST_ARCH_IA32
         thread_state_flavor_t flavor = i386_THREAD_STATE;
         i386_thread_state_t state;
@@ -528,7 +528,7 @@ class Sampler::PlatformData : public Malloced {
 #define REGISTER_FIELD(name) __e ## name
 #else
 #define REGISTER_FIELD(name) e ## name
-#endif // __DARWIN_UNIX03
+#endif  // __DARWIN_UNIX03
 #else
 #error Unsupported Mac OS X host architecture.
 #endif  // V8_HOST_ARCH