[tracing] Switch to new heap dump format.

third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp

Index: third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp
diff --git a/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp b/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp
index 59269a23ddb36111e0d587e768524599fbfdc7fb..ff2bb460a7bbc42cf6ced8f3f9a68e61b78f1e35 100644
--- a/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp
+++ b/third_party/WebKit/Source/platform/PartitionAllocMemoryDumpProvider.cpp
@@ -135,17 +135,7 @@ bool PartitionAllocMemoryDumpProvider::OnMemoryDump(
 
   MemoryDumpLevelOfDetail level_of_detail = args.level_of_detail;
   if (allocation_register_.is_enabled()) {
-    // Overhead should always be reported, regardless of light vs. heavy.
-    base::trace_event::TraceEventMemoryOverhead overhead;
-    std::unordered_map<base::trace_event::AllocationContext,
-                       base::trace_event::AllocationMetrics>
-        metrics_by_context;
-    // Dump only the overhead estimation in non-detailed dumps.
-    if (level_of_detail == MemoryDumpLevelOfDetail::DETAILED) {
-      allocation_register_.UpdateAndReturnsMetrics(metrics_by_context);
-    }
-    allocation_register_.EstimateTraceMemoryOverhead(&overhead);
-    memory_dump->DumpHeapUsage(metrics_by_context, overhead, "partition_alloc");
+    memory_dump->DumpHeapUsage(allocation_register_, kPartitionAllocDumpName);
   }
 
   PartitionStatsDumperImpl partition_stats_dumper(memory_dump, level_of_detail);