Enable sharding of AllocationRegister on desktop.

third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.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 BlinkGCMemoryDumpProvider_h
 #define BlinkGCMemoryDumpProvider_h
 
 #include "base/trace_event/memory_dump_provider.h"
+#include "base/trace_event/sharded_allocation_register.h"
 #include "platform/PlatformExport.h"
 #include "platform/heap/BlinkGC.h"
 #include "platform/wtf/Allocator.h"
-#include "platform/wtf/ThreadingPrimitives.h"
 #include "platform/wtf/text/WTFString.h"
 
 namespace base {
 namespace trace_event {
 
-class AllocationRegister;
 class MemoryAllocatorDump;
 
 }  // namespace trace_event
 }  // namespace base
 
 namespace blink {
 class WebMemoryAllocatorDump;
 
 class PLATFORM_EXPORT BlinkGCMemoryDumpProvider final
     : public base::trace_event::MemoryDumpProvider {
@@ skipping 21 matching lines @@
   base::trace_event::ProcessMemoryDump* CurrentProcessMemoryDump() {
     return current_process_memory_dump_.get();
   }
 
   void insert(Address, size_t, const char*);
   void Remove(Address);
 
  private:
   BlinkGCMemoryDumpProvider();
 
-  Mutex allocation_register_mutex_;
-  std::unique_ptr<base::trace_event::AllocationRegister> allocation_register_;
+  base::trace_event::ShardedAllocationRegister allocation_register_;
   std::unique_ptr<base::trace_event::ProcessMemoryDump>
       current_process_memory_dump_;
-  bool is_heap_profiling_enabled_;
 };
 
 }  // namespace blink
 
 #endif