Revert of skstd -> std for unique_ptr

src/core/SkSharedMutex.h

Index: src/core/SkSharedMutex.h
diff --git a/src/core/SkSharedMutex.h b/src/core/SkSharedMutex.h
index 21c9f46d64058f28e4d1273d5b40095340a8a4dd..840c2d36adf152b50087675eb1140c78001dd407 100644
--- a/src/core/SkSharedMutex.h
+++ b/src/core/SkSharedMutex.h
@@ -14,7 +14,7 @@
 
 #ifdef SK_DEBUG
     #include "SkMutex.h"
-    #include <memory>
+    #include "SkUniquePtr.h"
 #endif  // SK_DEBUG
 
 // There are two shared lock implementations one debug the other is high performance. They implement
@@ -50,9 +50,9 @@
 private:
 #ifdef SK_DEBUG
     class ThreadIDSet;
-    std::unique_ptr<ThreadIDSet> fCurrentShared;
-    std::unique_ptr<ThreadIDSet> fWaitingExclusive;
-    std::unique_ptr<ThreadIDSet> fWaitingShared;
+    skstd::unique_ptr<ThreadIDSet> fCurrentShared;
+    skstd::unique_ptr<ThreadIDSet> fWaitingExclusive;
+    skstd::unique_ptr<ThreadIDSet> fWaitingShared;
     int fSharedQueueSelect{0};
     mutable SkMutex fMu;
     SkSemaphore fSharedQueue[2];