Move Partition Allocator into Chromium base.

third_party/WebKit/Source/platform/heap/PageMemory.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PageMemory_h
 #define PageMemory_h
 
 #include "platform/heap/HeapPage.h"
 #include "wtf/Allocator.h"
 #include "wtf/Assertions.h"
 #include "wtf/Compiler.h"
-#include "wtf/allocator/PageAllocator.h"
+#include "wtf/allocator/Partitions.h"
 
 #if OS(POSIX)
 #include <sys/mman.h>
 #include <unistd.h>
 #endif
 
 namespace blink {
 
 class RegionTree;
 class RegionTreeNode;
@@ skipping 182 matching lines @@
  private:
   PageMemory(PageMemoryRegion* reserved, const MemoryRegion& writable);
 
   PageMemoryRegion* m_reserved;
   MemoryRegion m_writable;
 };
 
 }  // namespace blink
 
 #endif