Observatory: Fix allocation profile CVS export. Fix heap snapshot in/out reference counts.

runtime/observatory/lib/src/elements/allocation_profile.dart

Index: runtime/observatory/lib/src/elements/allocation_profile.dart
diff --git a/runtime/observatory/lib/src/elements/allocation_profile.dart b/runtime/observatory/lib/src/elements/allocation_profile.dart
index f126544760aa0d11434e82e3bda03d5dd4c856f9..1e4cb71cf88316034ab1dbc6b368196938be711f 100644
--- a/runtime/observatory/lib/src/elements/allocation_profile.dart
+++ b/runtime/observatory/lib/src/elements/allocation_profile.dart
@@ -547,7 +547,7 @@ class AllocationProfileElement  extends HtmlElement implements Renderable {
                     '"(OLD) Current Size"',
                     '"(OLD) Current Instances"',
                     'Class'
-                    ].join(';') + '\n';
+                    ].join(',') + '\n';
     AnchorElement tl = document.createElement('a');
     tl..attributes['href'] = 'data:text/plain;charset=utf-8,' +
         Uri.encodeComponent(header +
@@ -572,7 +572,7 @@ class AllocationProfileElement  extends HtmlElement implements Renderable {
       _getOldCurrentSize(s),
       _getOldCurrentInstances(s),
       s.clazz.name
-    ].join(';');
+    ].join(',');
   }
 
   static int _getAccumulatedSize(M.ClassHeapStats s) =>