Revert of Modernize SkMutex and SkSemaphore.

src/lazy/SkDiscardableMemoryPool.cpp

Index: src/lazy/SkDiscardableMemoryPool.cpp
diff --git a/src/lazy/SkDiscardableMemoryPool.cpp b/src/lazy/SkDiscardableMemoryPool.cpp
index 2be4c755f1e0c3196fbc13a439333c7cdeadd55f..1f3bcf93e92bc1cfa784a70330c2e6721b87d2bb 100644
--- a/src/lazy/SkDiscardableMemoryPool.cpp
+++ b/src/lazy/SkDiscardableMemoryPool.cpp
@@ -29,7 +29,7 @@
     /**
      *  Without mutex, will be not be thread safe.
      */
-    DiscardableMemoryPool(size_t budget, SkMutex* mutex = nullptr);
+    DiscardableMemoryPool(size_t budget, SkBaseMutex* mutex = nullptr);
     virtual ~DiscardableMemoryPool();
 
     SkDiscardableMemory* create(size_t bytes) override;
@@ -52,9 +52,9 @@
     #endif  // SK_LAZY_CACHE_STATS
 
 private:
-    SkMutex* fMutex;
-    size_t   fBudget;
-    size_t   fUsed;
+    SkBaseMutex* fMutex;
+    size_t       fBudget;
+    size_t       fUsed;
     SkTInternalLList<PoolDiscardableMemory> fList;
 
     /** Function called to free memory if needed */
@@ -128,7 +128,8 @@
 
 ////////////////////////////////////////////////////////////////////////////////
 
-DiscardableMemoryPool::DiscardableMemoryPool(size_t budget, SkMutex* mutex)
+DiscardableMemoryPool::DiscardableMemoryPool(size_t budget,
+                                             SkBaseMutex* mutex)
     : fMutex(mutex)
     , fBudget(budget)
     , fUsed(0) {
@@ -240,7 +241,7 @@
 
 }  // namespace
 
-SkDiscardableMemoryPool* SkDiscardableMemoryPool::Create(size_t size, SkMutex* mutex) {
+SkDiscardableMemoryPool* SkDiscardableMemoryPool::Create(size_t size, SkBaseMutex* mutex) {
     return new DiscardableMemoryPool(size, mutex);
 }