Make LockImpl::Unlock available for inlining

base/synchronization/lock_impl_win.cc

Index: base/synchronization/lock_impl_win.cc
diff --git a/base/synchronization/lock_impl_win.cc b/base/synchronization/lock_impl_win.cc
index 31f95f4e394ba6af3bc52e8b4472251a7d35740b..7a2ff72fc8d6a2fd98efd344de5cb432d17fe7c3 100644
--- a/base/synchronization/lock_impl_win.cc
+++ b/base/synchronization/lock_impl_win.cc
@@ -22,9 +22,5 @@ void LockImpl::Lock() {
   ::AcquireSRWLockExclusive(&native_handle_);
 }
 
-void LockImpl::Unlock() {
-  ::ReleaseSRWLockExclusive(&native_handle_);
-}
-
 }  // namespace internal
 }  // namespace base