Make LockImpl::Unlock available for inlining

base/synchronization/lock_impl_posix.cc

Index: base/synchronization/lock_impl_posix.cc
diff --git a/base/synchronization/lock_impl_posix.cc b/base/synchronization/lock_impl_posix.cc
index e54595b87f10a353647d4a0ee40aa30d2a649780..5ad337d9f715c749b0397cacb8d994e070f5cd57 100644
--- a/base/synchronization/lock_impl_posix.cc
+++ b/base/synchronization/lock_impl_posix.cc
@@ -4,11 +4,9 @@
 
 #include "base/synchronization/lock_impl.h"
 
-#include <errno.h>
 #include <string.h>
 
 #include "base/debug/activity_tracker.h"
-#include "base/logging.h"
 #include "base/synchronization/lock.h"
 
 namespace base {
@@ -65,11 +63,6 @@ void LockImpl::Lock() {
   DCHECK_EQ(rv, 0) << ". " << strerror(rv);
 }
 
-void LockImpl::Unlock() {
-  int rv = pthread_mutex_unlock(&native_handle_);
-  DCHECK_EQ(rv, 0) << ". " << strerror(rv);
-}
-
 // static
 bool LockImpl::PriorityInheritanceAvailable() {
 #if PRIORITY_INHERITANCE_LOCKS_POSSIBLE() && defined(OS_MACOSX)