Enable sharding of AllocationRegister on desktop.

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

Index: third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.h
diff --git a/third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.h b/third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.h
index b1c5ca473f0fe2c53994e71f36f4cc3138c13fbe..f8e699acd3d5506dfce30801d193f1beb182f30a 100644
--- a/third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.h
+++ b/third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.h
@@ -6,16 +6,15 @@
 #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
@@ -57,11 +56,9 @@ class PLATFORM_EXPORT BlinkGCMemoryDumpProvider final
  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