Revert "Add current rss and embedder name to Observatory"

runtime/observatory/lib/src/service/object.dart

Index: runtime/observatory/lib/src/service/object.dart
diff --git a/runtime/observatory/lib/src/service/object.dart b/runtime/observatory/lib/src/service/object.dart
index ef9499cd4cf68d8b33a14e5ebf7ce4d2c65ec7ef..7d238edac02f7fe3d65f6ac755da4d3d3b727289 100644
--- a/runtime/observatory/lib/src/service/object.dart
+++ b/runtime/observatory/lib/src/service/object.dart
@@ -669,7 +669,6 @@ abstract class VM extends ServiceObjectOwner implements M.VM {
   String version = 'unknown';
   String hostCPU;
   String targetCPU;
-  String embedder;
   int architectureBits;
   bool assertsEnabled = false;
   bool typeChecksEnabled = false;
@@ -677,8 +676,7 @@ abstract class VM extends ServiceObjectOwner implements M.VM {
   int pid = 0;
   int heapAllocatedMemoryUsage = 0;
   int heapAllocationCount = 0;
-  int maxRSS;
-  int currentRSS;
+  int maxRSS = 0;
   bool profileVM = false;
   DateTime startTime;
   DateTime refreshTime;
@@ -980,11 +978,13 @@ abstract class VM extends ServiceObjectOwner implements M.VM {
       nativeZoneMemoryUsage = map['_nativeZoneMemoryUsage'];
     }
     pid = map['pid'];
-    heapAllocatedMemoryUsage = map['_heapAllocatedMemoryUsage'];
-    heapAllocationCount = map['_heapAllocationCount'];
-    embedder = map['_embedder'];
+    if (map['_heapAllocatedMemoryUsage'] != null) {
+      heapAllocatedMemoryUsage = map['_heapAllocatedMemoryUsage'];
+    }
+    if (map['_heapAllocationCount'] != null) {
+      heapAllocationCount = map['_heapAllocationCount'];
+    }
     maxRSS = map['_maxRSS'];
-    currentRSS = map['_currentRSS'];
     profileVM = map['_profilerMode'] == 'VM';
     assertsEnabled = map['_assertsEnabled'];
     typeChecksEnabled = map['_typeChecksEnabled'];