Modernize SkSpinlock.

src/gpu/batches/GrBatch.cpp

Index: src/gpu/batches/GrBatch.cpp
diff --git a/src/gpu/batches/GrBatch.cpp b/src/gpu/batches/GrBatch.cpp
index 19c19ffcf1d05d1d988a4c6172ff507c05a811c0..8af1c1e0880ddd0673cbeeb1adf628c25c47b69f 100644
--- a/src/gpu/batches/GrBatch.cpp
+++ b/src/gpu/batches/GrBatch.cpp
@@ -20,7 +20,7 @@
 // memory barrier between accesses of a context on different threads. Also, there may be multiple
 // GrContexts and those contexts may be in use concurrently on different threads.
 namespace {
-SK_DECLARE_STATIC_SPINLOCK(gBatchSpinlock);
+static SkSpinlock gBatchSpinlock;
 class MemoryPoolAccessor {
 public:
     MemoryPoolAccessor() { gBatchSpinlock.acquire(); }