Memory-infra: Change "objects_count" to "object_count" in category name.

base/trace_event/trace_event_memory_overhead.cc

Index: base/trace_event/trace_event_memory_overhead.cc
diff --git a/base/trace_event/trace_event_memory_overhead.cc b/base/trace_event/trace_event_memory_overhead.cc
index b685d7183f2e4a2411cc212ed3b3987780dee85f..ba7207d616360e2409ca14fd0d8b5a49ffcb52b4 100644
--- a/base/trace_event/trace_event_memory_overhead.cc
+++ b/base/trace_event/trace_event_memory_overhead.cc
@@ -147,7 +147,7 @@ void TraceEventMemoryOverhead::DumpInto(const char* base_name,
                    it.second.allocated_size_in_bytes);
     mad->AddScalar("resident_size", MemoryAllocatorDump::kUnitsBytes,
                    it.second.resident_size_in_bytes);
-    mad->AddScalar(MemoryAllocatorDump::kNameObjectsCount,
+    mad->AddScalar(MemoryAllocatorDump::kNameObjectCount,
                    MemoryAllocatorDump::kUnitsObjects, it.second.count);
   }
 }