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-rw-r--r--ipc/chromium/src/mojo/core/ports/port.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/ipc/chromium/src/mojo/core/ports/port.cc b/ipc/chromium/src/mojo/core/ports/port.cc
index 871ec8fca6..df46ae100d 100644
--- a/ipc/chromium/src/mojo/core/ports/port.cc
+++ b/ipc/chromium/src/mojo/core/ports/port.cc
@@ -8,6 +8,10 @@ namespace mojo {
namespace core {
namespace ports {
+#ifdef MOZ_USE_SINGLETON_PORT_MUTEX
+mozilla::StaticMutex detail::PortMutex::sSingleton;
+#endif
+
// Used by std::{push,pop}_heap functions
inline bool operator<(const mozilla::UniquePtr<Event>& a,
const mozilla::UniquePtr<Event>& b) {