Enable sharding of AllocationRegister on desktop.

third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.h

Index: third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.h
diff --git a/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.h b/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.h
index eb379de310ce5152e55d8bd1513d788b811e1059..f2be837dd561cdcf8534f33178b38312421daee3 100644
--- a/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.h
+++ b/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.h
@@ -7,13 +7,12 @@
 
 #include "base/trace_event/memory_dump_provider.h"
 #include "platform/wtf/Noncopyable.h"
-#include "platform/wtf/ThreadingPrimitives.h"
 #include "public/platform/WebCommon.h"
 
 namespace base {
 namespace trace_event {
 
-class AllocationRegister;
+class ShardedAllocationRegister;
 
 }  // namespace trace_event
 }  // namespace base
@@ -42,9 +41,8 @@ class BLINK_PLATFORM_EXPORT PartitionAllocMemoryDumpProvider final
  private:
   PartitionAllocMemoryDumpProvider();
 
-  Mutex allocation_register_mutex_;
-  std::unique_ptr<base::trace_event::AllocationRegister> allocation_register_;
-  bool is_heap_profiling_enabled_;
+  std::unique_ptr<base::trace_event::ShardedAllocationRegister>
+      allocation_register_;
 };
 
 }  // namespace blink