memory-infra: Move dump level check to observer and rename session state

base/trace_event/process_memory_dump_unittest.cc

Index: base/trace_event/process_memory_dump_unittest.cc
diff --git a/base/trace_event/process_memory_dump_unittest.cc b/base/trace_event/process_memory_dump_unittest.cc
index 4ee6508190c14048f3a0899b4e24917e65bf52eb..70f897c6b39dcc047e7de11a5a92206a944542e1 100644
--- a/base/trace_event/process_memory_dump_unittest.cc
+++ b/base/trace_event/process_memory_dump_unittest.cc
@@ -94,22 +94,22 @@ TEST(ProcessMemoryDumpTest, TakeAllDumpsFrom) {
   metrics_by_context[AllocationContext()] = { 1, 1 };
   TraceEventMemoryOverhead overhead;
 
-  scoped_refptr<MemoryDumpSessionState> session_state =
-      new MemoryDumpSessionState;
-  session_state->SetStackFrameDeduplicator(
+  scoped_refptr<HeapProfilerSerializationState>
+      heap_profiler_serialization_state = new HeapProfilerSerializationState;
+  heap_profiler_serialization_state->SetStackFrameDeduplicator(
       WrapUnique(new StackFrameDeduplicator));
-  session_state->SetTypeNameDeduplicator(
+  heap_profiler_serialization_state->SetTypeNameDeduplicator(
       WrapUnique(new TypeNameDeduplicator));
-  std::unique_ptr<ProcessMemoryDump> pmd1(
-      new ProcessMemoryDump(session_state.get(), kDetailedDumpArgs));
+  std::unique_ptr<ProcessMemoryDump> pmd1(new ProcessMemoryDump(
+      heap_profiler_serialization_state.get(), kDetailedDumpArgs));
   auto* mad1_1 = pmd1->CreateAllocatorDump("pmd1/mad1");
   auto* mad1_2 = pmd1->CreateAllocatorDump("pmd1/mad2");
   pmd1->AddOwnershipEdge(mad1_1->guid(), mad1_2->guid());
   pmd1->DumpHeapUsage(metrics_by_context, overhead, "pmd1/heap_dump1");
   pmd1->DumpHeapUsage(metrics_by_context, overhead, "pmd1/heap_dump2");
 
-  std::unique_ptr<ProcessMemoryDump> pmd2(
-      new ProcessMemoryDump(session_state.get(), kDetailedDumpArgs));
+  std::unique_ptr<ProcessMemoryDump> pmd2(new ProcessMemoryDump(
+      heap_profiler_serialization_state.get(), kDetailedDumpArgs));
   auto* mad2_1 = pmd2->CreateAllocatorDump("pmd2/mad1");
   auto* mad2_2 = pmd2->CreateAllocatorDump("pmd2/mad2");
   pmd2->AddOwnershipEdge(mad2_1->guid(), mad2_2->guid());