Revert of skstd -> std for unique_ptr

src/core/SkSharedMutex.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkSharedLock_DEFINED
 #define SkSharedLock_DEFINED
 
 #include "SkAtomics.h"
 #include "SkSemaphore.h"
 #include "SkTypes.h"
 
 #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
 // an interface similar to pthread's rwlocks.
 // This is a shared lock implementation similar to pthreads rwlocks. The high performance
 // implementation is cribbed from Preshing's article:
 // http://preshing.com/20150316/semaphores-are-surprisingly-versatile/
 //
 // This lock does not obey strict queue ordering. It will always alternate between readers and
 // a single writer.
@@ skipping 15 matching lines @@
 
     // Release lock for shared use.
     void releaseShared();
 
     // Fail if shared lock not held.
     void assertHeldShared() const;
 
 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];
     SkSemaphore fExclusiveQueue;
 #else
     SkAtomic<int32_t> fQueueCounts;
     SkSemaphore       fSharedQueue;
     SkSemaphore       fExclusiveQueue;
 #endif  // SK_DEBUG
 };
 
 #ifndef SK_DEBUG
 inline void SkSharedMutex::assertHeld() const {};
 inline void SkSharedMutex::assertHeldShared() const {};
 #endif  // SK_DEBUG
 
 class SkAutoSharedMutexShared {
 public:
     SkAutoSharedMutexShared(SkSharedMutex& lock) : fLock(lock) { lock.acquireShared(); }
     ~SkAutoSharedMutexShared() { fLock.releaseShared(); }
 private:
     SkSharedMutex& fLock;
 };
 
 #define SkAutoSharedMutexShared(...) SK_REQUIRE_LOCAL_VAR(SkAutoSharedMutexShared)
 
 #endif // SkSharedLock_DEFINED