Fix MSVC warning about missing operator delete.

src/splay-tree.h

Index: src/splay-tree.h
diff --git a/src/splay-tree.h b/src/splay-tree.h
index 388f9b5429f889bc7aebcefaf90ba543a7f3178d..8844d8a8ffeb2d62a856ff19a1bdc2ff58e8aa24 100644
--- a/src/splay-tree.h
+++ b/src/splay-tree.h
@@ -66,9 +66,13 @@ class SplayTree {
                             AllocationPolicy allocator = AllocationPolicy())) {
     return allocator.New(static_cast<int>(size));
   }
-  INLINE(void operator delete(void* p, size_t)) {
+  INLINE(void operator delete(void* p)) {
     AllocationPolicy::Delete(p);
   }
+  // Please the MSVC compiler.  We should never have to execute this.
+  INLINE(void operator delete(void* p, AllocationPolicy policy)) {
+    UNREACHABLE();
+  }
 
   // Inserts the given key in this tree with the given value.  Returns
   // true if a node was inserted, otherwise false.  If found the locator
@@ -119,9 +123,14 @@ class SplayTree {
     INLINE(void* operator new(size_t size, AllocationPolicy allocator)) {
       return allocator.New(static_cast<int>(size));
     }
-    INLINE(void operator delete(void* p, size_t)) {
+    INLINE(void operator delete(void* p)) {
       return AllocationPolicy::Delete(p);
     }
+    // Please the MSVC compiler.  We should never have to execute
+    // this.
+    INLINE(void operator delete(void* p, AllocationPolicy allocator)) {
+      UNREACHABLE();
+    }
 
     Key key() { return key_; }
     Value value() { return value_; }