[tracing] Switch to new heap dump format.

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

Index: third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.cpp
diff --git a/third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.cpp b/third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.cpp
index d4077870cb4a24b2248731ff0b491e088bc20cd0..5856bb25c990a54762d5e300cee2ec8f5dcb9496 100644
--- a/third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.cpp
+++ b/third_party/WebKit/Source/platform/heap/BlinkGCMemoryDumpProvider.cpp
@@ -66,16 +66,7 @@ bool BlinkGCMemoryDumpProvider::OnMemoryDump(
   DumpMemoryTotals(memory_dump);
 
   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;
-    if (level_of_detail == MemoryDumpLevelOfDetail::DETAILED) {
-      allocation_register_.UpdateAndReturnsMetrics(metrics_by_context);
-    }
-    allocation_register_.EstimateTraceMemoryOverhead(&overhead);
-    memory_dump->DumpHeapUsage(metrics_by_context, overhead, "blink_gc");
+    memory_dump->DumpHeapUsage(allocation_register_, "blink_gc");
   }
 
   // Merge all dumps collected by ThreadHeap::collectGarbage.